Can you add own background sounds on iOS 15?

so can you add background sounds uh in iphone so yeah when i'm going here the only z6 balance noise bright noise dark noise ocean rain and stream and there is no possibility to add a new sound so that's that's about it if you have any ideas how you can do it or know any insight that it can be added in next ios releases just leave it in the comments below                                                                                                                                                                                                                                                                                                

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