I wish for cross-vault embedding of markdown files. That is…  URL embeds to work as embedding any other document from the current vault.
My use case: I have project specific vaults, which may need to cross-reference information, or use documentation snippets from a shared knowledge base.
As determined in our conversation for embedding local files, this is not covered by that other FR. It seems to not be covered by (although similar to) the Transclude / Embed Remote Files with http links FR.