I need a list of product short names for a Jira project, over a thousand all in all. I took from already existing custom fields in our company a field called "Affected Products" (multi-select list and asked to replace the existing product with the list that I provided. All fine and dandy so far.
But I am not happy with the way the field works though, I have to make multiple choices by pressing down ctrl

I would prefer the same kind of multi-select as in Component/s field so that I can start typing a value and click it to select, then start typing next value and select it, see example below.

When asking for similar kind of script from our IT, they said that it is available only for system fields, is that true? Or is there a custom field type that would work?