Hey @miso872,
Since a particular Certificate is attached to a specific course, you could simply add the course name and instructor as plain text. The course completion (or certificate award date) are already available as a merge code.
The rest will need custom code by a WordPress developer (https://lifterlms.com/experts/) who could use an available filter: https://github.com/gocodebox/lifterlms/blob/master/includes/certificates/class.llms.certificate.user.php#L203-L212 to add custom merge codes for the course grade.
If you’d like to add the course name as a merge code and by course date, you mean something other than the completion date, you’d still need to go the custom code way. Here’s an example that adds the course title dynamically to the certificate: https://gist.github.com/actual-saurabh/ad74bbe12993f06f5f04aa9dce7f9637 that you could use to get started.
I hope this helps. Do let me know if you need more information or help with this.
Best