How to Make a Line Break in rmarkdown Header?

I am trying to insert a line break inside the header paragraph in rmarkdown.

---
title: "Untitled"
output: word_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
someValue <- 1
```

## `r paste0("1. Attempt to set line break here ->  \n new line with value: ", someValue)`

## `r paste0("2. Attempt Line Feed, U+000A here ->  ",intToUtf8(strtoi("0x000A"))," new line with value: ", someValue)`

## `r paste0("3. Attempt Vertical Tab, U+000B here ->  ",intToUtf8(strtoi("0x000B"))," new line with value: ", someValue)`

## `r paste0("4. Attempt Form Feed, U+000C here ->  ",intToUtf8(strtoi("0x000C"))," new line with value: ", someValue)`

## `r paste0("5.  Carriage Return, U+000D here ->  ",intToUtf8(strtoi("0x000D"))," new line with value: ", someValue)`

## `r paste0("6. Next Line, U+0085 here ->  ",intToUtf8(strtoi("0x0085"))," new line with value: ", someValue)`

## `r paste0("7. Line Separator, U+2028 here ->  ",intToUtf8(strtoi("0x2028"))," new line with value: ", someValue)`

## `r paste0("8.  Paragraph Separator, U+2029 here ->  ",intToUtf8(strtoi("0x2029"))," new line with value: ", someValue)`

## `r paste0("9.  Breaks ->  <br> new line with value: ", someValue)`

## `r paste0("|\n  |10. Pipes break here ->   \n  | new line with value: ", someValue)`

## `r paste0("|\n  <center>11. Center tag here ->   </center>\n  <center>new line with value: ", someValue, "</center>")`

## Unsuitable <br>  
## as giving two separate paragraps and wrong TOC

This code is returning wrong output.

Unfortunately I failed to get any useful information from here as well.

So I am stuck. Please, can anyone help me to set the line break from inside the R code?

Appended

upon @MrFlick comment.

Here is the desired output - a multiline (single) paragraph with user defined positions of line breaks (equivalent of Word's SHIFT + ENTER).

You may use officedown

---
title: "Line Break Solutions"
output: word_document
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
library(officedown)
```
## This is my header `r officer::run_linebreak()` with a line break

Alternative 1

If you run above code, then inspect the underlying XML structure of the resulting word, it gives

<?xml version="1.0" encoding="UTF-8"?>
<w:document
    xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"
    xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math"
    xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"
    xmlns:o="urn:schemas-microsoft-com:office:office"
    xmlns:v="urn:schemas-microsoft-com:vml"
    xmlns:w10="urn:schemas-microsoft-com:office:word"
    xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"
    xmlns:pic="http://schemas.openxmlformats.org/drawingml/2006/picture"
    xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing">
    <w:body>
        <w:p>
            <w:pPr>
                <w:pStyle w:val="Title" />
            </w:pPr>
            <w:r>
                <w:t xml:space="preserve">Line</w:t>
            </w:r>
            <w:r>
                <w:t xml:space="preserve"></w:t>
            </w:r>
            <w:r>
                <w:t xml:space="preserve">Break</w:t>
            </w:r>
            <w:r>
                <w:t xml:space="preserve"></w:t>
            </w:r>
            <w:r>
                <w:t xml:space="preserve">Solutions</w:t>
            </w:r>
        </w:p>
        <w:bookmarkStart w:id="20" w:name="this-is-my-header-with-a-line-break" />
        <w:p>
            <w:pPr>
                <w:pStyle w:val="Heading2" />
            </w:pPr>
            <w:r>
                <w:t xml:space="preserve">This is my header</w:t>
            </w:r>
            <w:r>
                <w:t xml:space="preserve"></w:t>
            </w:r>
            <w:r>
                <w:br w:type="textWrapping"/>
            </w:r>
            <w:r>
                <w:t xml:space="preserve"></w:t>
            </w:r>
            <w:r>
                <w:t xml:space="preserve">with a line break</w:t>
            </w:r>
        </w:p>
        <w:bookmarkEnd w:id="20" />
        <w:sectPr />
    </w:body>
</w:document>

So copying the relevant part and parsing it within a openxml chunk also works without the need for library(officedown)

---
title: "Linebreak Solutions"
author: "Tim G"
output: word_document
---

```{=openxml}
<w:bookmarkStart w:id="20" w:name="this-is-my-header-with-a-line-break" />
<w:p>
<w:pPr>
<w:pStyle w:val="Heading2" />
</w:pPr>
<w:r>
<w:t xml:space="preserve">This is my header</w:t>
</w:r>
<w:r>
<w:br w:type="textWrapping"/>
</w:r>
<w:r>
<w:t xml:space="preserve">with a line break</w:t>
</w:r>
</w:p>
<w:bookmarkEnd w:id="20" />
```

and gives:

which you can then try to mold into a function:

---
title: "Linebreak Solutions"
output: word_document
---

```{r, results='asis', echo=FALSE}
linebreak_header <- function(id, bookmark_name, header_text, style = "Heading1") {
  
  strings <- strsplit(header_text, "<br>")[[1]]
  txts <- paste0(lapply(
    strings,
    \(x) paste0(
      '<w:r>\n<w:t xml:space="preserve">',
      x,
      ifelse(match(x, strings) != length(strings), '</w:t>\n</w:r>\n<w:r>\n<w:br w:type="textWrapping"/>\n</w:r>\n', '</w:t>\n</w:r>\n')
    )
  ) |> unlist(), collapse = "\n")
  
  cat(
    paste0(
    '```{=openxml}\n<w:bookmarkStart w:id="', id, '" w:name="', bookmark_name, '" />\n<w:p>\n<w:pPr>\n<w:pStyle w:val="', style, '" />\n</w:pPr>\n',txts, '</w:p>\n<w:bookmarkEnd w:id="', id, '" />\n```\n'
    )
  )
}

someValue <- 1
linebreak_header(
  id = 20,
  bookmark_name = "Test",
  header_text = paste0(
    "Attempt to set line break here <br> new line <br> and another: ",
    someValue
  ),
  style = "Heading2"
)
```