Thank you James
Your comments encourage me to keep making stuff. :)
I searched a bit on finding the center of gravity, Its math is way beyond my knowledge.
Although, I've made a macro months ago to get the average of points.
I'll attach it here, so if it was helpful It can be a starting point to write a node.js file.

About adding "Shuffle" and "Reverse" options to the "extract" node's point mode,
I had some success, (added "Shuffle" and "Reverse" to points and objects mode)
But, I have to study more on adding extra outputs to the node.
Specially adding output for a specific option rather than all options.