This may work or WordPress too (I don’t really use WP) but I found this module for Joomla – demo: https://aaextensions.com/demo/joomlademo/index.php/demo-show/aa-google-business-reviews
The built in Gantry5 Testimonials particle is ok but quite basic! These days especially with Covid-19, business sites need the ability to add Google Reviews to the site and have them update automatically.
As Google have not really released and proper widgets, this could be an opportunity for JL to provide a solution that I see as quite unique.
I know that you are busy (always) but thought this may be a good idea.
Of course for now I can use the module above, but as there is nothing like it as a Particle, thought that I would suggest it.