isoquant gradient with Victory Chart

I have asked a question on how to create a linear gradient with Victory Chart previously here, but now I wonder if it is also possible to build a gradient with isoquant curves, like in this picture:

It should be related to radial gradients in CSS, but I cannot figure out the logic to get the isoquant curves:

<svg>
        <defs>
          <radialGradient
            id="iso_gradient"
            // gradientTransform="rotate(10)"
          >
            <stop offset="0%" stopColor={colorScale[4]} />
            <stop offset="25%" stopColor={colorScale[4]} />
            <stop offset="25%" stopColor={colorScale[3]} />
            <stop offset="50%" stopColor={colorScale[3]} />
            <stop offset="50%" stopColor={colorScale[3]} />
            <stop offset="50%" stopColor={colorScale[2]} />
            <stop offset="75%" stopColor={colorScale[2]} />
            <stop offset="75%" stopColor={colorScale[1]} />
            <stop offset="90%" stopColor={colorScale[1]} />
            <stop offset="90%" stopColor={colorScale[0]} />
            <stop offset="100%" stopColor={colorScale[0]} />
          </radialGradient>
        </defs>
      </svg>