Connect loudspeakers to projector?

I bought a new projector, but the sound quality is not the best.

Since there's only one AUDIO IN connection for jack plugs, I unfortunately couldn't connect my speakers. The projector is only used for Netflix etc. (via a Chromecast).

Is there a solution to connect boxes via a receiver or something similar?

I once added a picture with the available connections.

That would only work with an HDMI audio extractor

https://www.amazon.de/...B07FX6C7TP