There are many Q&A here in RPi SE that discuss various technical aspects of USB hubs. In your case (based on your question), it seems the key feature you need is a
self-powered USB hub - vs a
host-powered hub. In summary, the
self-powered hub will provide power to the drives that are plugged into the hub, thus saving capacity of your RPi power supply.
If you can find a self-powered hub that supplies 2 amps at 5V in a single port, that will probably be sufficient to power your RPi 4 under most scenarios. Note that the "official" recommendation for a supply for the RPi 4 is for 5V and 3 amps., but the basis for this recommendation has never been disclosed. In other words, 5V and 2 amps will cover you in most situations.
The RPi 4 is the only RPi that uses a USB-C connector. However, there is no electrical advantage to powering the RPi 4 with a USB-C power source because the RPi 4 will take only a 5VDC (nominal) input - same as USB-A. The RPi 4 is "wired" such that it will not allow power delivery at any voltage above 5 V (nominal). So yes - if you have a self-powered, USB-C compliant port, it is safe to connect it to the RPi 4.
But once again, having the ability to source 2 amps at 5VDC is the key. Note that some USB-C power sources will claim the ability to serve as a 100 Watt charger for laptops, etc. Know that this jargon is irrelevant to powering an RPi 4. That said, if you wish to delve deeper into the USB Power Delivery Specifications, you could start with this excellent Q&A.