Gospel Library is currently available on the Google Play Store, Amazon Appstore, iOS App Store, and Microsoft Store. Most other Church apps are available only on the Google Play Store and iOS App Store.
You may be able to install the Amazon Appstore on your Huawei device from here, then install Gospel Library:
https://www.amazon.com/gp/feature.html? ... 1003016361
(Be sure to report back if it works!)
Alternatively, if you're a member of the Church living in China, you can get Gospel Library through the area office.
If there's more demand in the future, the Church could look into making apps available on Huawei AppGallery, but that's unlikely to happen in the short term.