Klipper Syntax Highlighter using Highlight.JS

I'm trying to create a syntax highlighter for the Klipper 3D printer firmware. The language consists of settings elements, comments and Jinja2 template elements. In the first place, I wanted to get a simple highlighting working but I'm hitting a road block.

Highlighter Code:

hljs.registerLanguage("klipper", function (hljs) {
  const COMMENT = {
    scope: "comment",
    variants: [
      { begin: /^\s*[#;].*$/, end: /$/ }, // Standalone comments
      { begin: /(?!\s)[#|;].*/, end: /$/ }, // Inline/trailing comments
    ],
    relevance: 10,
  }

  const KEY_PART = {
    scope: "symbol",
    begin: /^[^=\s]+(?=\s*[:=])/,
    //end: /^(?!\s).+?\s?[=:](?=(?:[^\n]*$))/,
  }

  const VALUE_PART = {
    scope: "addition",
    begin: /[:=][\s*|$]/,
    //end: /\r?\n$/, // Match until the end of the line
    end: /$/, // Match until the end of the line
    excludeBegin: true, // Ensure the separator is not included
    excludeEnd: true,
  }

  const SECTION = {
    scope: "addition",
    begin: /^\s*\[/,
    end: /\]/,
    contains: [
      {
        scope: "title",
        match: /[^\]]+/,
      },
    ],
  }

  const INDENTED_BLOCK = {
    scope: "deletion",
    begin: /^\s+/,
    end: /$/,
    relevance: 10,
  }

  return {
    name: "Klipper Config",
    aliases: ["klipper", "cfg"],
    disableAutodetect: true,
    contains: [COMMENT, SECTION, KEY_PART, VALUE_PART, INDENTED_BLOCK],
  }
})

My issue is that I cannot get a regex or setting for properly matching the VALUE_PART, for example:

[idle_timeout]
gcode:
    {% if printer.pause_resume.is_paused %}

While a simple key/value pair, like step_pin: PC2, matches, the regex fails if the key is not directly followed by a value, but the statements are in an indented block below. The indented block should be formatted as INDENTED_BLOCK. See the following screenshot.

Basically, the VALUE_PART formatting is "bleeding into" this block, but only for the first line of such an indented block.

Fiddle with the code is here: https://jsfiddle.net/Sineos/54yz89e3/

Any pointer how to solve this would be really appreciated. Many thanks in advance.

The token \s also matches \r and \n and that's why it is stepping over the line break.

Just doing:

  const VALUE_PART = {
    scope: "addition",
    begin: /[:=]/,
    end: /$/, // Match until the end of the line
    excludeBegin: true, // Ensure the separator is not included
    excludeEnd: true,
  }

does the trick. Fiddle is updated.