UTM in order list

Hello, I think it's possible. But the question arises, where to get the list from and what to do if you want to put down a custom utm that is not in the list?
ps utm tags are such things. which are usually not filled in manually, they must be entered themselves when creating an order from one or another source. And also in your case, it is most likely more convenient to use the "source" field in the process, it has a drop-down list from the very beginning.