Add values to a custom field for other users' ideas Merged

I would like to be able to collect not only votes, but additional data in an Idea custom field when users express interest in an item.

Scenario: In an internal-only portal, we are collecting ideas based on customer requests. When a Customer Success Manager or a Technical Support Officer submits a new feature request, they can specify the customer asking for it. When they hear the request from one more customer, they can edit their own ideas. However, when they vote for existing ideas coming from other users, they cannot add new customers to the Customer field as well.