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$gameParty.battleMembers()[member_index]._states.filter(state_id => state_id == req_state_id).length

- $gameParty.battleMembers() is the function call to get the battle members

- $gameParty.battleMembers()[member_index] specifies a battle member, member_index must be a number (begins at 0 for first member)

- $gameParty.battleMembers()[member_index]._states gives the states for that member in ID form

- $gameParty.battleMembers()[member_index]._states.filter(state_id => state_id == req_state_id) filters the states and returns an array that meets the required ID. req_state_id must be a number

- $gameParty.battleMembers()[member_index]._states.filter(state_id => state_id == req_state_id).length gives the number of states in the array

I recommend you learn array filter going forward before continuing. 

i = 0;

req_state_id = 4;

var = $gameTroop.members()[i]._states.filter(state_id => state_id == req_state_id).length

$gameVariables.setValue(172,var)

this is the script call i used but its getting a unexpected = error