Pacios..
Could you possible to develop calcuation add in the indi for the trend signal up/down as per formula and paint arrows
 

trend look back bars /4 = next down trend no. for reversal

example:
trend look back blue bars (uptrend) =8nos
Future down trend bar (downtend) = ??
ANSWER: 8 / 4 = 2 nos. (see snap)