Pass content from TypoScript to fluid template in TYPO3 7.6

I would like to read content via TypoScript and render it through a custom Fluid template. Without css_styled_content or fluid_styled_content.

temp.test = CONTENT
temp.test {
  table = tt_content
  select.languageField = 1
  select.selectFields = bodytext,image,header,header_link
  select.where = colPos = 1
  renderObj = FLUIDTEMPLATE
  renderObj {
    file = path/to/Teaser.html
  }
}

This works with strings, say

<f:debug>{data.header}</f:debug>

But not with

<f:debug>{data.image}</f:debug>

returning only the number of images.

Now, in a classic TypoScript RenderObj (maybe a COA), you would have added something like

10 = FILES
10 {
  required = 1
  references {
    table = tt_content
    fieldName = image
  }
  renderObj = IMAGE
  renderObj {
    file.import.data = file:current:originalUid // file:current:uid
    file.width=654
    file.height = 327c
    //stdWrap.typolink.parameter.data = file:current:link
    altText.data = file:current:description // file:current:title // file:current:alternative
  }
}

While nowadays, we want to do that in the Fluid template. But how to resolve the FAL image to pass it to the fluid template?

You should be able to use the TYPO3\CMS\Frontend\DataProcessing\FilesProcessor data processor that will fetch the file data for you so you can access it with {files} in your template.

renderObj = FLUIDTEMPLATE
renderObj {
  file = path/to/Teaser.html
  dataProcessing {
    10 = TYPO3\CMS\Frontend\DataProcessing\FilesProcessor
    10.references.fieldName = image
  }
}