Listen to Ps4 and pc at the same time, is that possible?

I have a laptop ne PS4 and a screen here. Screen without AUX output! I want to hear both at the same time. Ingame sound but also what happens on the laptop. YouTube, Spotify, Twitch etc. The screen has only one HDMI input.

PS4 and laptop does not work, because both are outputs. Hence the 2nd screen. But if I use it to gamble, I'll hear nothing except I have headphones connected to the controller. But I do not want to chill, because I just want to hear everything about my system because it is chillier. Is it understandable?

As?

I'm at most confused.

I do not think that works with the system. This is possible with a headset, for example the A50 from Astro

Moin arcstride,
I myself stream with Dual-Pc Setup.
Currently I have a gaming PC, stream laptop and a PS4 connected.
Through a mixer, I've connected all the audio outputs of the devices so that I can hear everything about my headphones and adjust the volume levels individually.

Depending on what your setup is intended, a mixer with such a structure is an acquisition that you can think about.