Feature Request: Custom Expiration Fields in "Editing Unit"

Please add a "Custom Field" option for reminders in the Editing Unit section. While the current fields (License Plate, Inspection Sticker, and Insurance Expiration) are helpful, they do not cover state-specific regulations.

For instance, we need to track a specific "PA Inspection Sticker Expiration" for Pennsylvania, but we cannot currently do so without custom fields. Adding this feature would allow us to stay compliant with varying state laws.

See the  SCREENSHOT example for Custom Label.