5 Packs USB-C PD Trigger Board Module PD/QC Decoy Board Tools for Fast Charge USB Type-c to 5V9V12V20V High Speed Charger Power Delivery Boost

Excellent, then this is the trigger board you'll need to make a USB PD capable power bank output the desired voltage: https://www.amazon.com/Trigger-Module-5V9V12V20V-Charger-Delivery/dp/B0F1YH9P4X And you will need a power bank that supports USB PD like this: https://www.amazon.com/Baseus-Charging-20000mAh-Portable-Certified/dp/B0GK8H8MJ9 If you can't find one with multiple PD ports that has a price you like, you can always use a single USB C port to request the highest voltage you need and use an additional DC DC buck converter to step it down for the second device.