Push ntfy instead of google in the Android app

Hey everyone, can anyone tell me why the app I downloaded from F-droid is asking for Google Push? I don’t have any Google services on my Huawei P40 Lite. I understand that it can be configured push, but why if there is, for example, there is ntfy Which works great in many applications, like Matrix Synapse Element and others. I’m wondering if it can be configured in the client somehow nextcloud fdroid vission 3.34.1 push ntfy? Thank you