You can. You can get em off the shelf too with the boost converter inside a chonky USB plug and proper 3/4 pin fan compatible plug like https://www.amazon.com/CRJ-Voltage-Step-Up-Sleeved-Adapter/dp/B07QFG6LFR

Yup, here ya go:

3090 Backplate Cooler

And I used this for power:

Cooler Power USB to 4-pin