You have to look hard on LinkedIn for anyone with pronouns. I looked through my contacts and couldn't find one, other than my DH.
DH has set his - Comrade/comrade in LinkedIn. His Dad was a union convenor, so he still retains the socialist thinking he grew up with. His opinion of the Left now in Britain is unprintable.
Comrade/comrade is probably the ultimate non-binary pronoun. I'm thinking about employing it myself -and best of all, when prompted to reveal my pronouns in a meeting, whether in-person or in Zoom/Teams, Comrade has to be the ultimate killer response!