It should be relatively simple. Your TV should have a digital audio (optical) output port. Your Bose has a 3.5mm audio input (https://www.bose.com/en_us/support/article/connecting-an-external-audio-device0.html). So all you need to do is convert the digital audio to 3.5mm. Assuming of course you're talking about these speakers (https://www.bose.com/en_us/support/products/computer_speakers_support/companion-5-multimedia-speaker-system.html) and Bose doesn't have a different Companion 5 speaker system out there somewhere.
Step 1. Buy a convertor (I use this one https://www.amazon.com/PROZOR-Digital-Converter-Toslink-Adapter/dp/B00KNNSKV0/ref=sr_1_3?ie=UTF8&qid=1548384554&sr=8-3&keywords=optical+to+3.5)
Step 2. Buy either a 3.5mm to...