pattrstorage manipulations with JS ?

hi mates,
designing a sequencer, I'm storing each step parameters in a pattrstorage
all works very fine.

basically, in this strange sequencer, a step = a bpatcher = a bunch of data = a "tree" of data

sending (storagewindow) to my pattrstorage, I can see all my parameters, my storage slots etc.

now the point:
I'd need to swap, offset some leafs of the "tree" of data I mentionned above.
examples:
- this particular branch has to be switched with this other one
- all branches have to be offseted to the lfet or right (which means all my table has to be altered by moving all to the index + 1 then the latest become index = 0 ..)

I'd like to do that with JS because it sounds really easier.

any leads for me ?