The reason official ports of Notepad++ don’t exist for iOS or Android is because the core of Notepad++ was written using the Win32 API, which is the MS Windows way of handling window management and intra-process and inter-process communication. This API is significantly different than the various GUI toolkits available for Android or iOS. By the time enough of the Notepad++ codebase was re-written to be able to work on those completely different platforms, they would cease to be Notepad++.

(There is someone who released something they called “Notepad++” to Android, IIRC, but it is unaffiliated with the official Notepad++ discussed here, and has nothing to do with the codebase or this project or forum.)

To sum up: I am sure there are plaintext editors available for iOS and Android, but Notepad++ is not one of them; some in the Notepad++ community may have text editors that they use or recommend for their portable devices, but that’s not actually the focus of this forum, so I don’t know how good of an alternative suggestion you will get. But, to be helpful, let me google that for you on iOS and Android.

When will that be possible?

Never. Because it doesn’t make any sense.