Create GitLab Shell Extensions: Running custom ssh commands?

We are on our third GitLab evaluation.
We are currently using Gitolite.

With Gitolite we have created some Gitolite Shell Extensions.
Commands we can run with SSH to query Gitolite for information.

> ssh help
Commands are:
where-is-file <filename expression>     Find file in repositories
find-repository <repo name expression>  Find repository
list-owned-repositories [<user>]        List repositories where user is owner
list-owners <repository>                List owner(s) of repositories
list-users                              List registered users
user-statistics [<user>]                Show various user stats
show-syntax                             Show command syntax (and regex format)
help                                    Show this help and exit

Is this possible to create with GitLab?