I wanna know if it is possible to put 3 highlight sliders inside the SliderTrack, and at the of day the slider should look like this:

You should be able to nest anything you want inside of a slider track, you just might need to write some logic to get that to work the way you want. What kind of measurement does that slider represent exactly?
Nice!
Alright, so the measurement represents a monetary value, so the width of these divs inside the slider track has to change when I move the slider handle from left to right or vice versa.
So this is untested, but if you control the value I imagine you could do something along these lines:
function MoneySlider({ value, onChange, min, max }) {
// assumes the shorter bar is 50% of the larger bar, adjust the math accordingly
let smallTrackPercent = ((value / 2 - min) * 100) / (max - min);
return (
<SliderInput>
<SliderTrack>
<div style={{ position: `absolute`, left: 0, height: `100%`, width: `${smallTrackPercent}%` }} />
<SliderTrackHighlight />
<SliderHandle />
</SliderTrack>
</SliderInput>
)
}
Again, that may need some tweaking but start there and let me know if you run into any limitations.