This is how I search for git working directories:
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wfn:child:.git
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wfn:child:.vscode
child: and wfn: have been available for a long time, at least since version 1.3.4 but I just figured this out now.

Also it would be pedantically correct if there was a way to make sure the child found is a folder.
Unfortunately something like
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folder:wfn:child:.git