3D Touch wouldn't do much for that anyway, I'm afraid - all of its old functions were replaced by Haptic Touch, but there's no equivalent to Screen Reader from either of those.
If it's any consolation, Google have been trying to ban functions like Screen Reader for years; they almost banned all screen reading apps last year but changed their minds at the last minute, but they have banned apps from overlaying the screen on Android Go Edition devices now, and I wouldn't be at all surprised if they ban them on all Android devices in Android 11 or 12. So you might not have gotten to use it on Android for very much longer either
The best equivalents to Screen Reader we can offer on iOS are:
1) "OCR Last Screenshot" on startup, which you can enable in Settings / Miscellaneous. With that, you can just take a screenshot and tap on the Pleco icon to instantly bring up Pleco's OCR function on that new screenshot. Not *quite* as seamless as Screen OCR, but pretty close.
2) Search clipboard on startup, same settings screen, which will let you do that with text copied to the clipboard.
3) Configure "3D Touch shortcuts" in Settings / Miscellaneous and you can add shortcuts for both of those functions to the menu you get by long-pressing on our app's icon.
3) Web Reader, as
@Shun says, gives you easy tap-lookup support on web pages. (actually nicer / more reliable than using Screen Reader on web pages on Android; if embedded web views on Android weren't so buggy / awful we'd probably offer a similar function on that)