How to search data in MySQL database?

I am using nextant 1.0.3 in nextCloud 11. I have configured Solr to be able to index data in a MySQL database. (ref:
However, since there is no a “database” option in “external storage” backends to select, how can I search data content from the database?

That’s interesting, I might add this feature to Nextant

Hi, I learned that “searching within SQL database” is added to nextant github ( May I know any update of this please?