Hi Partilha,
You are calling a server action to send the mail, so follow these steps to get the information.
1. Pass the Id of the entity that contains all the records to the server action.

2. Add an aggregate to that server action filter with the Id you will get all the needed records.

3. Pass that record as a new argument to the email. And you will receive all the records in the email template as an Input Parameter. and you can display the information in the template.

Use the Current, not the List.
Hope this will help you.
Thanks and Regards,
Sreejith Surendran