Like i said before, your TV is NOT an Acer product. It is made by Indkal, who pays Acer to use Acer name on their TVs.
"Official" specs:
https://acertvindia.com/product/v-series-qled-google-tv/
On-top of that, your TV is dirt cheap.
₹12,999 = €145.68.
I looked around on my local stores and cheapest 32" QLED TV that i can get, costs €210, from Hisense brand.
As the saying goes: when you pay peanuts - you will get monkeys.
Many TVs use on-board power brick. This makes the external power cord slimmer and can be shorter as well. It gives the TV more "sleek" looks.
Also, pico-PSUs can output up to 210W. So, when TV consumes less than that, no point to add bulky power brick to the external cord, e.g like it is with several laptops.
Lubuntu should be able to run it without issues. I have Lubuntu on my ancient laptop, running like a charm and my laptop only has 512 MB of RAM (DDR2, at 900 Mhz). And 4GB SSD too. So, Lubuntu for sure works, based on hardware specs your TV has.
Link:
https://lubuntu.me/
Lubuntu is so lightweight, that it can even run on Raspberry Pi.
Speaking of Raspberry Pi; Raspberry Pi OS is another lightweight option.
Link:
https://www.raspberrypi.com/software/