add variation products to sitemap

So i have a smaller webshop (woocommerce), that contains a lot of products – and some of those products have variants – like blue, yellow, red and so on. But the thing is that Rank Math sitemap generator only indexes the main products. Lets say i have a toy car in multiple colors (white, blue, yellow, red). Yoast SEO will create a link for the default (white) toy car:

http://www.examplewebshop.com/products/toy-car/

How to add all the other variations to the sitemap?

http://www.examplewebshop.com/products/toy-car/?attribute_pa_color=blue
http://www.examplewebshop.com/products/toy-car/?attribute_pa_color=red
http://www.examplewebshop.com/products/toy-car/?attribute_pa_color=white

I also could use such a sitemap width all the variations in WP-Rocket to preload the products to the cache
I hope you could help, and I do not have to add all that links manually

Thanks
Luis