Git allows you to set push options when pushing a branch to the remote.
You can use this to build an alias that automatically pushes a branch and creates a merge request for it.

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Put this in your ~/.gitconfig in the [alias] section:

mr = push origin HEAD -o merge_request.create -o merge_request.draft

Now you can do git mr and a draft merge request will be created.
Target branch is your project's default branch, i.e. main or master.

To specify a different target branch, add -o merge_request.target=other-branch.

There are many more options Show archive.org snapshot that you can use to customize the created merge request.