Migrating from Jenkins to GitLab

How to convert .grooyy files that is in BitBucket to .yaml file that have to move later on GitLab ? Please suggest.

Do you like have an tool to migrate , i mean for the repo migration you have created congregate, like that is there any utility

Pretty useless and misleading video

So not helpful. This is reference, not tutorial.

This is not descriptive at all. How can I move my jobs from Jenkins here? How to configure through .yaml file