Suggested Bookmark Features
A bookmark is associated with a book, and has a label, and can be moved.
For example, I would have a bookmark labeled "morning" for my reading Bible, and one labeled "evening", and perhaps two or three labeled with some topic.
Then in some other resource, a bookmark or two labeled with a topic or whatever is helpful...
There could be a limit of bookmarks per resource, perhaps 5 or 10, or maybe a higher number or unlimited, depending how this would affect the application.
Then as I am reading, I can advance in the text, then choose bookmarks, see those for the current resource, and relocate the appropriate bookmark to the current location.
This sounds pretty close to what we already have in Favorites and Bookmarks. What task are you trying to do that you can't do in the existing system? https://support.logos.com/hc/en-us/articles/360016517871-Favorites-Bookmarks