I didn't find a study for Inside bar as I wanted. Therefore I wrote a one with PineV4. This may help you to see inside bars.
It can recalculate and works with either (opens-closes) or (highs-lows)
+Main and inside bar different calculation
+ Default settings fixed
Settings panel now has followings
+ New Heiken-Ashi Candle stick calculation method.
+ Min/Max inside bar count
+ Main bar colorized as black
- Min/Max inside bar count removed for remastering