I would look here:
driver: https://github.com/starfive-tech/linux/tree/JH7110_VisionFive2_devel/drivers/net/wireless/eswin
firmware: https://github.com/starfive-tech/buildroot/tree/JH7110_VisionFive2_devel/package/starfive/usb_wifi
And as tempting as it may be to look at the driver and matching firmware here:
https://github.com/eswincomputing/eswin_6600u
I suspect that there might be problems using that under RISC-V.