Good news! I implemented this feature as a Plugin named Favorites it is vault independent so every vault has access to the same Favorit list. As a bonus it also works with Plugins.
I would appreciate if you try it and if any feedback I would love to hear from you here or if any issues or feature request on GitHub.
I initially intended to wait until the plugin was added to Obsidian’s plugin list before posting anything here, but five months have already passed. Therefore, if you would like to install it manually now, you may do so. The files can be found here.
See in Forum
See at Obsidian Community
See on GitHub
Directly to Obsidian