First, you need to decide if this is a one-off, or an on-going thing.
If it's a one-off, then an administrator can simply type each line in, although for a large or complex list, it might be worth doing it with a jelly script instead (a bit of work in a spreadsheet can be faster)
If it's a list that may vary and is held externally, then I'd assume that it's in a database somewhere (because any other storage is pretty pointless) and I'd reach for a plugin. For example - https://marketplace.atlassian.com/search?application=jira&category=&cost=&hosting=&marketingLabel=&q=database+values
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