integration with Hook

It seems that Calibre for macOS is not compatible with <a href="https://hookproductivity.com/what-mac-apps-are-compatible-with-hook-app" target="link">Hook</a>, at least, it is not mentioned there.
It would be wonderful to be able to deep-search through Hook into Calibre.
____________
By the way, it seems that the normal html markdown language is not recognised in <b>any</b> kind of editing. See attachment.
Can you help with this too?
Many thanks

Attached Thumbnails