Set project avatar via GitLab API

Is it possible to upload an avatar for a specific project with the GitLab API?

I could not find anything about this in the documentation.

There is a parameter avatar_url within the response of an edit or list request but it is not included as a valid edit parameter.

The allowed parameters (referred to the docu) are the following:

• id
• name
• path
• default_branch
• description
• issues_enabled
• merge_requests_enabled
• builds_enabled
• wiki_enabled
• snippets_enabled
• container_registry_enabled
• shared_runners_enabled
• public
• visibility_level
• import_url- id
• name
• path
• default_branch
• description
• issues_enabled
• merge_requests_enabled
• builds_enabled
• wiki_enabled
• snippets_enabled
• container_registry_enabled
• shared_runners_enabled
• public
• visibility_level
• import_url
• public_builds
• only_allow_merge_if_build_succeeds successful
• only_allow_merge_if_all_discussions_are_resolved merged
• lfs_enabled
• request_access_enabled
• public_builds
• only_allow_merge_if_build_succeeds successful
• only_allow_merge_if_all_discussions_are_resolved merged
• lfs_enabled
• request_access_enabled

I can not find any possibility to set an avatar_url.

There is a field here --> https://docs.gitlab.com/ee/api/projects.html#create-project-for-user called avatar but I’m not clear about which format the file needs to be uploaded (Fileblob, url, data64). Docs only says mixed and I always get 400 Bad Request

This might help:

I’m still having this issue, can anyone find a solution to this?
I tried the above mentioned “solution” but it just redirects me to my gitlab account.