When you search for a LabVIEW toolkit, you should start on www.vipm.io
Take a look at this one : https://www.vipm.io/package/hse_lib_gitlab_api/
if you need support HSE has a discord server, they are quite responsive.
What have you tried so far? https://docs.gitlab.com/ee/api/rest/ documents a REST API to gitlab servers. Did you look at that? Did you try anything? There is for instance the JKI REST API Toolkit that should let you talk to this.