GA: Custom Channel Grouping - Can I get that data?

Hi!

I am using a Custom Channel Grouping for my Data in Google Analytics. Unfortunately I am only able to get the data of the Default Channel Grouping into Excel - is there a way?

It would be a big thing for me if that is possible. Can someone help me with that?

Regards, Ben

Seems this isn't available through their API:

https://www.en.advertisercommunity.com/t5/Tracking-Goals-Ecommerce/Custom-Channel-Grouping-in-a-query/m-p/479580/highlight/true#