No, that's not what upscaling means. Upscaling means displaying lower resolution content in full screen. The display has got a scaler and your GPU also acts as one.
Since Netflix doesn't show 2560*1440 content, then it won't look as good because you're further away from your native resolution.
Infact, 1920*1080 content will look better on a 1920*1080 display than a 2560*1440 display.
And then of course the myth about 3840*2160. 1920*1080 content will not and cannot look as good as displaying it in it's native resolution.
Back on topic again, there are 2 ways, but both work only with games. AMD VSR and NVIDIA DSR.
All the best!