How to change spacer height in CMS

I’m trying to add an option to my collection list where a user can add more space or less space if needed. I have a spacer with a set height, but I don’t know how to make it editable in the collection. I guess I could use conditional visibility and create 5 separate spacer divs of different heights. Is this the only way, or is there a new and more efficient way to do this?

Thanks,
Ash


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