Color Gradient Material

I am working with point clouds in UE 4.24 and am designing materials to apply a color gradient to them. Here is an example of one of the gradients, which applies a color gradient in the X-direction based on Absolute World Position.

HighresScreenshot00000.jpg

I am trying to figure out something similar, but for a radial color gradient as opposed to a linear color gradient (i.e. colors band outward radially from a set position).

Here is the material diagram for the Gradient X material for reference:

Also, is it possible for a material to read in inputs; for example, to change the XYZ coordinates of the center of the radial banding to something other than the center point of the point cloud?

Thank you in advance!