There were a few other mentions of Hookmark on the Discord, so it seems there is interest in getting this working. I’ve asked the developers about the status.
I had a look at the BTT presets and the way they work is extremely hacky (it basically tries to drive the UI to the command palette and paste the note ID that is extracted from a shareable link).
I’ve also gotten an official reply on Discord to say that there is no deep linking at the moment.
I think our best bet at the moment is to upvote these: