We agree that this is a 'nice-to-have feature', and it's been added to our roadmap. However, it will take some time to move it into development as we're currently prioritising work on the core functionalities in CRM emails.

That said, a couple of months ago, two possible workarounds were shared in this thread---one by Haiku and another by me. 

We suggest using those available workarounds until the feature becomes available.