Looking at the documentation, it seems a shop section on Facebook is pretty well restricted to those three platforms, unless you’re willing to manually add items.
In general, it’s worth noting that you absolutely do not need a shop section to run Facebook Ads.
While Facebook Ads are well received and quite effective, I have yet to see anyone have success with a Business Page-based shop on Facebook. It was one of the most hyped areas of eCommerce a few years back, and it basically hasn’t materialised. I have never bought anything directly through Facebook and I don’t know of anyone else who has either. Therefore, I would say it’s rather a waste of time. (On the other hand, I’ve bought quite a few items via Facebook Ads.)
Our SEM team would be happy to assist with setting up Facebook Ads. If you would like to explore that, please open a ticket on the portal, and we’ll take it from there.