In Purview Glossary, you have the Definition field which behaves like a "Long answer" text field (allows for a lot of characters, and importantly makes the characters visible to users. Yet when you add attributes to a Custom Template, you do not have this choice. Could you please add the choice to have Long Answer text fields for the custom attributes? This is similar to what Microsoft does in Forms.
We definitely have a use case for a longer text field as a custom attribute.