G6, Sony A90J 55 and JBL SB190

[jungle]

Hi guys,

I am new to audio related technical settings, devices etc...

Current setup
Sony A90J 55 hdmi 2.1 port ++++++ cable+++++++ to hdmi 2.1 port PC RTX 3090
use it with 4K @120Hz.
Audio is 24 bit 192Khz with HDMI, RTX DAC?
A nintendo switch is also present.

To improve the audio experience.
Bought Sound BlasterX G6 and JBL A190 https://jp.jbl.com/SB190.html cinema speakers.
What will be the best way to connect the devices together? JBL can do transfer HDMI from in to out, but want to preserve 4k @120Hz video.

Thinking about
A90J opticalOut +++ G6 opticalIn
G6 opticalOut +++JBL opticalIn; G6 +++ USB +++ PC
PC +++ HDMI 2.1 +++ TV.

Thank you!