How to connect a 7.1 soundbar to a computer if there is 1 analog input in the soundbar, and 4 should be inserted into the computer?

Question

Audio

Tell me, what kind of cable is needed to connect a computer to the soundbar 7.1? The computer has 4 gens for this (1st photo), and the soundbar has only 1 analog (2nd photo). Now I have a soundbar connected through this cable, which is the same on both sides, and only plays stereo accordingly. Is there some kind of adapter from 4 to 1 or how is it done? At the end, I attach a photo that the soundbar has. Maybe some other cable is needed?

Answer 1

It is not done in any way, either this soundbar has other inputs, or it is a regular stereo, not 7.1

Answer 2

In the last photo I see optical S / PDIF, it can transmit 7.1.
But look for specific features in the user manuals or in the technical documentation, everything should be described there.