You can pass slash commands as a part of the description, so having
/assign @someone
as a part of the description did the trick for me. I'm not sure whether this is a bug or a feature, and whether it works with all GitLab and API versions.
UPD: Though do keep in mind that you can't submit multiline strings via push options, and as far as I can see, GitLab has no workaround that would work with slash commands. See this issue.
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You can pass slash commands as a part of the description, so having
as a part of the description did the trick for me. I'm not sure whether this is a bug or a feature, and whether it works with all GitLab and API versions.
UPD: Though do keep in mind that you can't submit multiline strings via push options, and as far as I can see, GitLab has no workaround that would work with slash commands. See this issue.