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Personally - I ordered a couple of extra OEM chargers (from BestBuy) to use around the house, as well as some nice ones from Anker (they were on sale at Amazon a few weeks ago) -- these all work well. I've got a RAVPower "Turbo" RP-PB043 battery that holds 20100 mAh -- I think this model is still available online. This one supports QC 3.0 output, as well as Type-C Output: although the online material doesn't explicitly state "USB-C Power Delivery", the battery puts out 5V / 3A (15W) over USB-C, and triggers the Pixel 2 XL to state "Charging Rapidly" -- and indeed, the phone charges quite quickly, does not become hot, and all seems to work quite well. Additionally, you can charge that battery using QC 3.0 input -- AND I've tested and found that, like proper USB-C power connections, I can charge the battery quite rapidly by plugging one of my USB-C chargers into the USB-C port on the battery -- so it is, in fact, bi-directional. It seems that the RAVPower battery is, indeed, quite compatible with both QC 3.0 and USB-C Power Delivery.
That said -- this new battery is appealing -- but I'd like to know if it will actually support both QC 3.0 and USB-C Power Delivery, and at what V/A/W output profiles. If that info isn't available, the appeal is greatly limited for any of us using devices that rely on USB-C Power Delivery.