Use case or problem
Remembering what YAML key:value pairs have been used can be tedious.
Relying on tags / templates is not always optimal.
When adding a new key, or value to existing key, it would be great to have a suggest / autocomplete option available, that pulled from existing data in the vault.
Proposed solution
A great example would be from https://github.com/marp-team/marp-vscode
Hit Ctrl + Space within the front-matter or HTML comment to show the list of directives. You can peek the help of selected directive by hitting Ctrl + Space again.
Current workaround (optional)
Tag workarounds have been suggested here and here.
Related feature requests (optional)
For the ‘YAML frontmatter improvements’ Roadmap Trello card