Does it support to send notifications for simple products which are part of configurable one?
The configurable product is in stock all the time, but some of the simple products are getting out of stock, and then back to stock.
Is it possible to have notifications for customers when (for example, S size is back in stock)?

Yes, you can configure it in the backend:
- Go to Products -> Product Alerts -> Out of Stock Notification -> Subscribers:
- Then you can add new Subscriber(s) by adding product SKU and customer's email.
- In the Product SKU, you can fill the simple product:
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