IBM i as datasource for MS PowerApps

Hi all,

I'm tasked to investigate whether it is possible to connect to our
(on-premises) IBM i and use that as datasource for an existing cloud
app created with Microsoft PowerApps.
So far I have set up some testresources and installed the Microsoft
on-premises data gateway.
(https://docs.microsoft.com/en-us/power-bi/service-gateway-onprem-indepth)
In the PowerApp I defined an IBM DB2 connector, but I can't get it to
work (as I expected since DB2 and DB2 for i are different flavours).

Another option seems to create a custom connector and let our IBM i
act as REST service.
(https://docs.microsoft.com/en-us/connectors/custom-connectors/)

Anybody done something similar before and have an advice what would be
a direction to explore?

Many thanks,
Arco Simonse