Are you running QEMU directly, or through libvirt (GNOME Boxes, Virt Manager)?
EDIT: NVM I see you’ve answered that in another comment. I believe you can’t do this with QEMU directly. If you don’t need to be able to edit the VM config besides core count, disk size and RAM use GNOME Boxes. Otherwise use Virt Manager.
Invidious has been a saviour for me on mobile. The ads were so painfully long. To make it worse, I’d use YouTube to help fall asleep, adjust it to the right volume, then BAM! Loud advert. I didn’t use an ad blocker on PC for ages because I get that bandwidth is expensive as hell, but they really started taking the piss and I gave up.