Hello , I was wondering if is possible in wilbur to rescale part of the map I am working on to produce a gradient rescale ... what Imean is I have the sea part that is too shallow , I want it more deep but I do not want to have an abrupt decrease of the heights near the coastlines so I would like something more gently fading toward the deeps ... to rescale the sea part like from -1000 -0 m to -10000 - 0 m .

Is it possible? Any tips on how ?
Thanks for any answer.