GitLab support haskell syntax highlighting in Web IDE

I couldn't find a suitable place to report issues with this gitlab instance. I would like to have haskell syntax highlighting in the gitlab Web IDE. At the moment this is blocked by upstream:

• https://gitlab.com/groups/gitlab-org/-/epics/11769
• https://gitlab.com/gitlab-org/gitlab/-/issues/355092
• https://gitlab.com/gitlab-org/gitlab/-/issues/407330
• https://gitlab.com/gitlab-org/gitlab/-/issues/407455