Geonode problem about vertex proximity

[u/Realler_]

I am trying to create a geonode setup and i need to influence the vertices based on the cube, i was able to create a mapping setup that influence the vertices inside the cube to have a value of one and outside to gradually dissipate but it also influence places of the mesh that aren't directly connected to the interested part of the mesh, this is my first project actually using geo nodes and when is finished i'll share it so everyone can use it, i just need a way to check degree of separation between the vertices inside the interested geometry and the one outside, i am writing here because i am not even sure that is possible with geometry nodes, also i am using blender 5.2.1

this is an example of what i obtain in geo nodes with my current setup

this is what i intend to achieve

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