About YAML

Things I have tried

Please advise

note has in YAML:


or in text:
During his work at Obsidian, a dozen project names have accumulated
New projects appear, old ones close.
How can I make it so that when opening a new note with a template where ‘project:’ is specified, a drop-down list of already existing project names is offered?
I have the “Completr” plugin installed, but exactly in ‘project:’ it doesn’t offer anything.
The use of plugins “Metadata Edit”, “Metadata Menu” in this case is not convenient.

What I’m trying to do