Adding user relationship when creating comments

According to the API when creating comments you can mention a application id for the comment to be related to. But its always created under a system user. Can i pass in a user relationship / user_id to make it so that the user is creating a comment. I can do that in the Pinpoint UI. When i make a comment on an applicant, it showing my name as the comment creator. I would like that to be enabled on the API if possible.