For the record of this topic, we released a solution using a community plugin (advanced-URI) in Hook Version 3.4.3 (4626, integration v. 201) earlier this month, which we updated on Friday with version 206 of Hook integrations.
See also Using Hook with Obsidian – Hook.
We’ve been communicating with Shida Li, developer of Obsidian. We sent him this late Friday: How to Make Your App Linkable via X-Callback-Url (For App Developers) – Hook, and by this morning he emailed us back this morning saying
Our new hook x-callback-url just went live in the insider build today.
We’re having a look.