In digital photography, ISO settings are just changing the gain of the transistors that amplify the signals output from the sensor. You effectively change the ISO in post production by adjusting exposure settings.
I'm not certain what you mean by the quiestion.
In some very specialized camera film, there were layers of emulsion that acted like a filter to create a wider dynamic range, when brighter light hit one area, the 2nd or even 3rd layer was exposed. This was used to film atomic explosions where extremely high DR was required.
The ability to selectively change ISO, pixel by pixel for digital photography is possible, but so far impractical. You can take quick successive images of a scene at different exposures by changing whatever parameters your camera allows.
And, finally, the dual pixel technology actually produces two images, one from each half of the pixel. Those images have a slightly different exposure (ISO?) due to their position. They can be combined along with the combined image output by the camera to increase DR and it works, but is normally not worth the hassle. Google DPR Split.
If I misunderstood the question, perhaps a explanation with more details might get me on the right track.