Cryptic usernames of people I know on #Signal are breaking my brain.

Can I use the nickname/petname feature "guilt-free" to rename people as I know them IRL? (i.e. that I am not leaking anything sensitive?

EDIT: Seems they are E2EE so I'm going to use them https://support.signal.org/hc/en-us/articles/360007319011-Manage-Contacts-Nicknames-and-Notes#contacts_nickname