Sorting publications alphabetically

I am trying to use BibBase to display publications on our institution website. I would like publications sorted by year, as default, but ordered alphabetically by first author name within each year.

Here is you current publication page: https://www.jurassica.ch/fr/Recherche-formation/Publications.html

I am trying to reproduce the same ordering with BibBase. Looking through the support posts I read that it was possible by ordering the bibtex file, but we would like to use Zotero as a source instead. Is there a simple way to achieve this?

Thanks in advance for your help and for the great work with BibBase!