You have 2 bottlenecks, if both can handle it then yes, if not then no
1. The SATA power connector is designed for up to 4.5A (54W @ 12v)
2. The wire carrying the 2 sata connectors has to support the combined current. Read the gauge on the wire and consult this chart:
https://www.powerstream.com/Wire_Size.htmAWG 18 is very common in PSU's and is designed for up to 16A (192W @ 12v) but cheaper PSU's sometimes use AWG 20 which is 11A or even 22 which is only 7.
If you're using powered risers then the cards get no power from the motherboard, only though the riser.
Example 1: You have a good quality PSU with AWG16 wires and it has a cable that has 3xAMP connectors. The wire supports 22 amps and the connectors supports 13 amps so the maximum each connector can drain is 88W. PCIe standard specifies that a card should not drain more than 75w so you can easily hook up 3 cards to one cable!
Example 2: You have a crappy PSU with AWG20 wires and it has a cable with 2xSATA connectors. The wire supports 11amps and the connectors support 4.5 amps so the maximum each connector can rain is 54W. If you video cards drain less than 54W then you're ok. If more then you'll have some melted connectors.