Ability to choose multi- or single-line text field for Block preview

Being able to manually select which field is used for a block’s title/preview would be helpful. As explained in this support topic, single-line-strings are currently prioritized, but giving us the ability to choose an existing multi-line or single-line text field would help preview block-content.

Happy to consolidate if needed – These seem like similar feature-requests, but more focused on blocks that don’t have text-fields to use for a title/preview:

Thanks for any help