Gradient Feather does not have a color -- it controls opacity of the object to which it is applied.
If you want to do it in InDesign you'll have overlay a frame on top of the image, add a blend and adjust its transparency. The blend could be black or gray to white set to Multiply with transparency amount adjusted as needed.
I prefer to do this kind of thing in Photoshop as an adjustment layer, which has the (slight) advantage of not adding transparency to the page, and maybe more control over the color. Something like this Curve adjustment with a blend in its mask. I can Option-White Arrow-Click the layout image to open in PS and adjust as needed:
Cheers thanks guys!