Hi Team,
Trust you are doing well!
I use this app as well - Zavala is great, and open source. The developer, Maurice, has a simple and wonderful micro blog, where he talks about his inspiring nomadic life in a van and his coding projects.
He’s really responsive with bug reports on Github, and he seems to have already opened one to create an applescript that could integrate Hook with Zavala. Interestingly, that was opened in May 2022, and this thread was last active in March 2022. So here I am, reviving them both 
I see that Zavala has a Copy Document Link command in the Edit menu, which returns the kind of links Hook looks for I believe - zavala://document?...blah-blah-blah. I tried to write a script but failed - it seems AppleScript is more difficult than I thought. But I suspect Zavala’s dictionary is insufficient somehow?!
Also, weirdly (after the Hook 5.0 update), I noticed that I can’t use the Focus on Link in Clipboard command for this link that Zavala gives (not that I could really use it - since it probably wouldn’t give me a document name, making things worse!)
I’ll post a comment on his GitHub issue to alert him about this thread I’m opening here. Hopefully, there can be some sort of meaningful discussions to make the hook work!
Thanks!