Huawei mobile service and app gallery

Question

I have published new app, I don't use any of google services such as maps or push notification, or authentication ...etc., the app functionality is simple and depend on our own business data.

I used Huawei Y9 EMUI version 9.1.0, and 10.0.0 ,I found the application on app gallery, and I installed it successfully and it worked perfectly.

but I have used Huawei Y9a EMUI version 10.1.1, also EMUI version 11.0.0, the application is not appear on app gallery, and if I open it by browser the install button will be disabled.
so I installed the package manually as (.apk)file, it worked perfectly so there is no any compatibility issue. but app still not appearing on app galley for these versions?

after communicating with Huawei customer service they just told me the following : " your app depends on GMS services, so it is only available on HUAWEI GMS devices. I suggest you integrate our HMS services into the app to make it be available on all of HUAWEI devices(including HUAWEI HMS devices). https://developer.huawei.com/consumer/en/hms"

so the point here how I can make this integration(the link they are send it , it is for the HMS in general) so what should I do to make my app appear on HMS? or how to integrate this service on Huawei app gallery?
is there step forward to do this task?