Dark mode on old iPad?

I still use my old iPad mini 2 for reading comics sometimes. The screen has the same ppi as the current mini 6, and for laying in bed the smaller form factor is kind of more comfortable.

Is there any way to force the app to use a dark mode on older iOS versions? I guess the app just follows whatever the OS default is, but the mini 2 doesn't get that feature from Apple because designed-obsolescence.

I tried to make theming backwards compatible, but it was a pita. Do you see the theming options in the global settings view?

Don't see it.

Yeah, I didn't remember exactly what I ended doing, but there is no theming support in old ios versions.

Not a huge deal. Just wondered about it.