Feeding a custom value to html src tag path completion


In my custom language plugin I have paths in html that look like this
<link rel="stylesheet" href="$ThemeDir/css/bootstrap.min.css">
Where $ThemeDir is a variable pointing to a directory. Is it possible for me to somehow yield this value to the path autocomplete/reference that's used by the html language or will I have to capture the whole url myself and redo it in my own language?

If I could yield it that would be awesome since then the normal autocomplete/reference would still work.

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