Get Field of Nearest/Linked Element

These nodes would allow getting data from connected/nearby elements (Geometry Proximity, Attribute Transfer or Raycast can do that in some cases, but are not reliable).

The first, Field Proximity (as opposed to Geometry Proximity) gives the attribute of the closest element that is not the element itself.

The second, Get Linked Field gives the attribute of connected points (vertices that share the vertex's edges, faces that share an edge with the face, etc... (see Select More action in Edit Mode)).

It would also allow to implement the "Grow/Shrink Cluster" node seen in the Geometry Nodes Design post. ( developer.blender.org/T74967 )

Here is a mockup of the nodes : The list of methods would be Min, Max, Average and Sum, respectively outputting the minimum, maximum, average or sum of attributes.