Is it possible to apply new custome price in RSI

 
I have one doubt. Is it possible to Apply Price Parameter (Ask+Bid)/2.  If possible please guideme
 
ECURRENCY TEAM: I have one doubt. Is it possible to Apply Price Parameter (Ask+Bid)/2.  If possible please guideme

MetaTrader does not use Mid Prices as its basis for chart OHLC data nor standard indicators, only the bid price! You would have to code your own setup for that, based on available tick data.