Add "Lookup" and "User List" custom field types

Currently, custom field types in Docusign are fixed, which limits how workflows can be set up for reporting and notifications. I'd like to propose two new field types:

1. Lookup field
Allow admins to import a reference list (e.g., via CSV) containing a code and description — similar to a lookup table. Users would select a code from this list when filling in the field, and both the code and description would be available for use in reports and Insights.

Use case: Cost center codes, project codes, department codes, etc., where the value needs to map to a standardized, centrally maintained list rather than free text.

2. User List field
Allow a field to reference a Docusign user or an email address (e.g., "Budget Holder"), selected from a list rather than typed manually.

Use case: Assigning a budget holder, approver, or responsible party to an agreement, so that this person can be automatically notified — for example, via Insights or reporting — when a related event occurs (expiry, renewal, threshold reached, etc.).