quick question, is it possible with the data command to set from a player entity?

/data modify storage minecraft:player_data 0[].Pos[0] set from entity @s Pos[0]
is the command i am trying to run, and currently Pos[0] is set to 0 and no matter where i am, the command says "Nothing chanced. The specified properties already have these values".
should i be using merge instead? also the first 0 in 0[].Pos[0] is the unique player and im trying to store player positions for later, if this is not possible the way i am trying to do it, i will just use scoreboards and scale accordingly.