Azure Api Management append api to existing api with arm

I wonder how you can append a second api to an already registered api in Azure api management via an ARM deploy?

If I use the same value for the name property in my Microsoft.ApiManagement/service/apis resource. It overwrites the whole api instead of appending it. I don't find a property in the arm reference docs to specify I want to append the api instead of overwriting it: https://learn.microsoft.com/en-us/azure/templates/microsoft.apimanagement/2019-01-01/service/apis

I want to accomplish the same result via arm, like I am able todo via the Azure portal import menu This is also described in the docs: https://learn.microsoft.com/en-us/azure/api-management/add-api-manually#append-other-apis

That is easily not possible at the moment. "Append" logic is implemented in UI, but it does rely only on publicly available ARM calls. You could inspect calls it makes to ARM to append one API to another and try to reproduce it "by hand".