Check out the Samsung 10,000mAh wireless battery pack. I had one when I had my S10e and it was great. Samsung tend to retail it at £49.99 which is clearly far too expensive but it's often on 50% discount. You can also pick it up from the rainforest or the bay for between £20-£30 if you look hard enough.
It definitely has QC2, it may not have 3.0 but don't quote me on that. It also has 15W fast wireless charge.