It's also a good use case for a good old .vcard, which already has semantics for plenty of contact fields, so I wouldn't be surprised if there are some for IRC.
Modern phones have done their utmost to end these. If you even find the option to load a vcard they will (often sneakily) copy the contents to Google Contacts or similar, and you don't know if the phone is even keeping the vcard updated. It has made the approach feel unreliable.
I've switched to self-hosting my contacts with Radicale[0] (with "backups" to a git repo) synced via DavX5[1], with no problem of them mixing with Google Contacts. It's pretty annoying though that basically no current contacts app recognizes common fields like the nickname for a person.