I've been waiting for months. They say it's coming Now you can do it with the Alidropship/Woocommerce plugin, but then you'll have to redo your entire site based on Woocommerce then pay for the feature (s).
This is quite simple option:
Add products that you want to be visible at the same page with a particular product and click Update. After that you will be able to see these products as Related on a single Product page.