Flutter - Hard color stop in linear gradient

I'm using CustomPaint to make a custom shape and I want to apply a color gradient but with hard color stops. Without color transitions.
PS:I cannot use different Paints instead of gradient because of the custom shape.

I checked the documentation and couldn't find anything. Is it impossible? Or is there any other workarounds? Thanks!

Okay I figured it out myself, I use Gradient.linear as the shader for custom paint. I noticed that it only blends colors when there is a big gap in stops. So I put my colors and stops like this.

Colors | Stop

Green 0.2
Green 0.201
Blue 0.5
Blue 0.501
Yellow 1

Now the color stops are hard.

Here's a preview of before and after |