Can I get 5.1 Surround Sound by connecting my PC to a SONOS Playbar?

Currently I have two Sonos Play:1s and a Play:5. I am considering purchasing a Playbar to get 5.0 surround sound for movies. However, I don't have a TV, only a large computer monitor. Is it possible to output surround sound from my windows laptop to the optical input that is on the Playbar? 

These are the components that I have:
Sonos Play:5
Two Sonos Play:1s
A windows laptop with 3.5mm, HDMI, USB-A, and USB-C outputs
A monitor with HDMI, DP, and DVI-D inputs, and a 3.5mm output
iFi iDSD DAC with an USB input and a 3.5mm output  (I'm not sure if there's a way to utilize this)

If I buy a Playbar, what else will I need to get surround sound? Thanks for the help!