I am afraid on iOS there are no easy work around, because you are not allowed to install app out of the App Store (I heard iOS 17 will have this feature).
However, you can use AltStore, is a program (Mac and Windows, no Linux if I am not mistaken) that allow you to side load 3 apps on you iPhone/iPad, but you will need to resign them every week to keep them working.
Having said that, as an iPadOS user, I can say that iTorrent is probably the best client to download torrents in your apple devices.
You can have a look at GitHub for more information. Sadly, the last update was on Sept 2020, but it stills work fine for me on my iPad Mini 5.
Good luck 😊
EDIT: I am sorry, do you want something to manage your torrents from your iPhone? If so, sorry, I completely missread your request.
I think you can find an app you can install with AltStore.
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I am afraid on iOS there are no easy work around, because you are not allowed to install app out of the App Store (I heard iOS 17 will have this feature).
However, you can use AltStore, is a program (Mac and Windows, no Linux if I am not mistaken) that allow you to side load 3 apps on you iPhone/iPad, but you will need to resign them every week to keep them working.
Having said that, as an iPadOS user, I can say that iTorrent is probably the best client to download torrents in your apple devices.
You can have a look at GitHub for more information. Sadly, the last update was on Sept 2020, but it stills work fine for me on my iPad Mini 5.
Good luck 😊
EDIT: I am sorry, do you want something to manage your torrents from your iPhone? If so, sorry, I completely missread your request.
I think you can find an app you can install with AltStore.