I made my OTG cable following a guide from the XDA site.
Nothing fancy, but a bit tricky to get everything properly placed and soldered.
I could find several guides for OTG and charging adapters over the net as phones seem to be so different in charging issues.
Some adapters on sale may work while some don’t.
I could read about several different resistors to enable or make the phone recognize chargers or set a specific (charge) mode. After all I was testing on my developer board which combination was actually working. But charging does not with OTG. Maybe I will give it another try some day to test. Nevertheless I could read that it would also rely on software drivers.
Also we don’t have a quick charge mode. We have some about ~500-600 mAh when a data connection is enabled (using all 4-wires out of 4) + computer or up to ~1400mAh without data connection (or using only 2-wires out of 2-4) + wall charger/power bank.
So have luck with your project. I guess you have read into this topic already.