This is interesting, I’ve seen this, I’ve found some ancient posts related to this:
How to change the style of the email template of the digest? - dev - Discourse Meta
Example Plugin: Custom Activity Summary Template - plugin - Discourse Meta
A more recent one: How to show Full Name in Embeds - dev - Discourse Meta may be able to help me get the desired effect, I will try this later and I will let everybody know how I get along.