With the new Workflow actions, you can further automate Bear without writing a single URL scheme yourself. They are quite powerful: you can create new notes in the app, open a specific note in Bear (something Apple Notes can't do), and even turn a webpage into Markdown and save it as a note in Bear.
My favorite action, though, is 'Add to Bear Note', which can take any file or text and append it to an existing note. I have a Scratchpad note in Bear where I keep a little bit of everything, and with this workflow I can quickly pick a file or a photo and send it to the bottom of the note. Great stuff.
Bear actions are available in the latest version of Workflow.