mimeo-style custom association file

[Anomalocaridid]

Mimeo, another resource opener, supports having an association file, separate from mimeapps.list, that gives you fine-grained control over which programs open which URLs or file types. For example, you can use regular expressions to open YouTube links in vlc or FreeTube or open files with programs by directly using file extensions rather than mimetypes.

Would it be possible to implement something similar? I know Rust and I would be more than happy to pitch in.