So what you need are line outs. Which apparently can also be referred to as a “preout” on a receiver from what I just read. An output is a preamp out if you have volume control. Anyway, one option is to make use your digital output of your TV. Or you could just use a cheap extractor like this
https://www.amazon.com/J-Tech-Digital-Extractor-Converter-JTDAT5CH/dp/B00BIQER0E