Is there a way to add a plus button on a field in Edit View?

So in leads for example when you throw Email Address onto the edit view then save and deploy, when you go to create a new lead (or edit an old lead) there is a plus button to add additional email addresses. I was wondering if I could also add the plus button to a field named CustomA, when I put the field CustomA on a module’s edit view, or if I had to do it through back end code.

This sort of collection field, perhaps?

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