Geometry nodes - "memory falloff" node

youtu.be/oQUwwsRW8bs here is example of bluefox creation's extension for animation nodes - it has "memory falloff" node which can be used to make similar effects like dynamic paint. This kind of node would make possible to generate/recreate "dynamic paint" in geometry nodes: cgcookie.com/articles/all-the-new-features-and-changes-in-blender-2-93 like here in the 2.93 review there is example from geometry nodes: "Attribute Proximity" here: s3.amazonaws.com/cgcookie-rails/uploads%2F1621899296321-geo-nodes-snow.gif this combined with memory node with time dissolve/dry and spread/shrink/drip/smudge would make possible to create own "dynamic paint" tool in geometry nodes. This could be also called "accumulation node"?

Also wondering is there any stessmap/tensionmap or velocity map (vertex velocity) nodes work in progress at the moment those would be very useful too.