UPDATE: I tried to generate a template document using Document Template element from Mendix, then in a microflow I used StringFromFile java action from CommunityCommons and then added that string into the email template and it worked.
Set the Placeholder entity and add the required tokens(attributes) and use them in html snippet!
Hi,
Add a attribute in the placeholder and add it in the Email template.
In the email send microflow, set the respective value in the token.
By this way, dynamic values can be appended in the template
Hope it helps!!!