Syntax highlighting on fold-line

By default, mvim uses blue/grey highlighting on a closed fold. I would like to configure the 'fold-text' on a closed fold to instead be the syntax highlighted text.

I thought I could turn off the colour highlighting and write a vim function to return a syntax highlighted line, then call it from 'fold-text'. But, I'm not sure how to proceed with the syntax highlighting function.


:set fold-text=SyntaxHighlightFoldText()
:function SyntaxHighlightFoldText()
: let line = some_syntax_format_function(getline(v:foldstart))
: return line


Syntax help discusses a few fold-specific settings. Are there provided vim functions to highlight content? I wonder if a "region" is helpful? Any guidance or opinions would be appreciated.

Thank you,
Richard

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