That's a very bad idea. Take it from an audiophile.Ironically, the reason I bought my USB-C to audio jack dongle was so I wouldn't have to plug my computer speakers into the front of my new Mac mini, cuz that just looks awful. However, in the end, I just plugged the amp into the audio jack on my monitor instead. However, I will use this dongle with my iPad Pro on the plane with my Etymotics.
And it still bugs me to this day that the 12" MacBook has two ports, but Apple chose to make one of them audio. I would have much rather have had 2 USB-C ports instead of 1 USB-C and 1 audio. Cuz with this US$9 dongle, you can convert USB to audio, but you can't audio to USB (iPod shuffle notwithstanding).
Monitors use cheaper DAC's , you will not be getting the full capability of your speakers by connecting it to your monitor.
The Lows would sound trash there will not be any depth to it , the highs will sound very high pitched rather than enjoyable