I have one Mi Pad 4 (3Gb/32Gb Wi-Fi) and with the battery at 20%, charging in a QC3.0 port, with the screen off it went to 1.85Ah at 5.05V. It was around 9Wh. So i can tell that it probably will go to 10Wh maximum and so it has probably only support for QC2.0.
I used a UGreen wall dual charger (one port QC3.0, the other is 2.4Ah) and the cable also a UGreen nylon that supports fast charge. They are found very easily in ebay and I strongly recommend this brand for charging (value/quality). For measuring I also used a very common usb tester that goes up to 5.1Ah/30V found also in ebay.
I can tell that with that same charger and cable, my Le Max 2 goes to a maximum of 24Wh(!) (around 8V/3Ah) when it was around 10-20% battery. So I can tell that the charger is at least outputing that power.