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How is possible to modify manually occupancy grid cells on a map?

So the point is that during the mapping with a mobile robot I will get a set of coordinates during the process. I was wondering, how is possible to modify the values of the occupancy grid cells nearby such coordinates.

For instance, these coordinates would represent objects that I don't want them in the map but they have been detected and stored in the map during the gmapping process as obstacles. I am not sure how to approach, whether using a real-time processing or post-processing.

Is there any available tool that can achieve something similar?