Grabber USB Install & Support

Hello,

I have just finished my installation of Rasplex/Ambilight.
I’m using leds APA 102 with Internal Frame Grabber.
Everything is ok and pretty nice.

Now I would change grabber to an external USB grabber. ( ID 1c88:0007 Somagic, Inc. SMI Grabber EasyCAP DC60+ clone )
When I launch lsusb command in ssh no firmware is present :

RasPlex:~ # lsusb
Bus 001 Device 004: ID 1c88:0007 Somagic, Inc. SMI Grabber (EasyCAP DC60+ clone) (no firmware) [SMI-2021CBE]

I follow this instructions to finally obtain a .bin from my Win Drivers .sys (CD delivrated with the grabber)
https://code.google.com/archive/p/easycap-somagic-linux/wikis/GettingStarted.wiki

A simple question :
Is-it possible to add my firmware to /lib/firmware maybe putting it /storage/.config/firmware and then reboot ? (already test without success)
If there is no way to install this Grabber USB, does Rasplex Client already supported directly others ?

Thanks