how to apply for custom capability with Microsoft prefix in UWP Application

The ESim class doc says it requires a custom capability declaration. And according to my local test, this capability also needs a sccd file to work properly. Since it's a custom capability with Microsoft prefix, who should i contact with if i want to request this capability for my application.

ESim: https://video2.skills-academy.com/en-us/uwp/api/windows.networking.networkoperators.esim?view=winrt-26100

HSA support: https://video2.skills-academy.com/en-us/windows-hardware/drivers/devapps/hardware-support-app--hsa--steps-for-driver-developers