allow more characters in "sameAs" field? or convert to multivalue single fields?

Problem/Motivation

A client has 7 "sameAs" URLs they want to use, and I can only fit 5 of them, in the charcter limit of the field.

Proposed resolution

Can we convert this to something much longer? (it doesn't look like there's a limit on this based on my googling).

Alternatively, convert it to a multivalue field? Or a text area that reads line breaks?