Gitlab 13.11.3-ee - Self-Service prompt for input variables for terraform pipeline

Greetings,
I must be using the wrong keywords, because I can’t find the answer.

I’m looking at how to have a form feed input variables for a manual pipeline I have created.
I hope to have a self-service form that will trigger a GKE Terraform job.
I’m trying to get away from having to use Jenkins for our Input Form.
Thanks.