Trello - Search for card from custom field data

Hi there -

I would like to retrieve a card from search using the ‘Search for card’ Trello’s Module in order to be able to attach to a specific card.

This search is based on data (email) that can be found on the custom field of the card.

It retrieves no data as it seems that the custom filed of a Trello card is not searchable.

Any solution ?