I automated all thumbnails for my blog site built with NextJS and I used Microlink Cards as the "thubmnails as a service" app.
I wrote about how I automated thumbnails like this one in my blog:
https://lucasbernalte.com/blog/como-generar-thumbnails
I wrote about how I automated thumbnails like this one in my blog:
https://lucasbernalte.com/blog/como-generar-thumbnails