I have just done this for one of our clients.
We created a new certificate type and used the customtext to name individual topics.
By editing the certificate.php file, found within the mod/certificate/type folder
We commented out the last line...
/* $pdf->WriteHTML($customtext); */
and inserted a new line within the cert_printtext block...
cert_printtext(200, 390, 'C', 'Helvetica', '', 20, utf8_decode($customtext));
Not a complete solution but now we can add a certificate to a topic and all we have to do is to name the topic in the customtext setting.
Hope this helps.
Custom certificate (plugin)
Listing Linked activity on certificate
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