Hi @Tommy101 and welcome to the community,
This feature actually used to be avalible with the use of Gravatar support, but was not consistent across client as I remember.
This was removed from the client and server code in preparation for the new avatar colour selector, which was recently rolled-out with the v2023.1.0 release.
Here is one final relevant link.
There is a request to change back to Gravatar support, or maybe using another method for custom profile icons which may be relevant.