I assume all one would need to distribute free apps on Huawei is upload the b4a generated .apk
Huawei and i developed Huawei Services Libs for B4A.
if you mean the Huawei Mobile Services (HMS) SDK, yes, they have a tutorial of how to integrate it to B4A, currently for Analytics and Push kit, i dont know who you need to contact, they contacted me from my FacebookI asked them 2 months ago some info about their in-app sdk they forwarded my mail to a few devs but never got an answer from any of them.
Is it the in-app sdk that you got working? if it exists I wonder why they didn't inform me about it to prevent double work.