Thanks, everyone!
Expert by experience (yes, I had to look the translation from a dictionary...) is a person who has gained expertise on an illness, trauma, disability, addiction etc. by surviving it, and then has gone through a training where one learns to use this expertise as a tool to help others in different roles.
It's not a full time job title for most, but one can eg. be a visiting speaker, work in healthcare development projects, as peer support, participate in work groups etc. Our healthcare system has really become interested in using experts by experience, since patient experience is valuable and knowledge learned from experience supplements academic knowledge on many subjects, and the feedback of using experts by experience has been really good.
I finished my training just around the time Covid hit, and so far have had just two speaking gigs, both to nursing school students. They went very well, and it felt awesome to share information that might help future nurses to treat well fellow Autists they are going to meet in the future.