Custom 'users' field with "current viewer" seach function


I just ran into the issue that my custom users field doesn’t provide the current viewer function in queries.
Found another guy with the same issue back in 2015:

“”: {
“name”: “Participants”,
“type”: “users”,
“search”: true,
“view”: true,
“edit”: true

Would like to be able to select it here:

But I’m not able to create a custom query containing Current Viewer on my users field: