Setting font fallback in YAML header using bslib

Is there a proper way to set the fallback font in the YAML header when a Google font is the desired one? In bs_theme(), it can be supplied to font_collection(), but it is not clear how a plain string name of a font family can be supplied in the YAML when a key:value entry is present for setting the Google font.

I think you can use any suffix of face_* as YAML field, then need to pass as value what is expected by the function.

I think something like this should work

      version: 4
          - !expr bslib::font_google("Pacifico", local = FALSE)
          - "Roboto"
          - "sans-serif"

I think the !expr is required here. I don't know if this is supported or just working with current implementation. You could open an issue in bslib to ask on how to provide a font collection with R Markdown documents.

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