Is there a way to charge a USB-C powerbank from a Mac Book Pro?

I have a USB-C powerbank. That is, a battery pack with a USB-C cable that can be used for charging the powerbank, or for charging other USB-C devices from the powerbank. If I plug the powerbank into my phone's USB-C port it'll charge the phone, but I can tell my phone to charge the powerbank instead. If I plug the powerbank into any of my MacBook Pro's USB-C ports it'll charge the laptop. Is there any way I can tell my MacBook Pro to charge the powerbank instead? I know I can charge other USB-C devices, like my phone or iPad, from my MacBook Pro's USB-C port.