WRBHG
Identifies Wide Range Body (WRB) and Hidden Gap (HG) bars. You might need to bring Indicator visibility order over the price series (from Objects Tree window). Otherwise if you use candlesticks it may get hidden behind candles.
study("WRBHG", overlay=true)
body = abs(open-close)
wrb = body>body[1] and body>body[2] and body>body[3] ? avg(open,close) : na
hg = (wrb[1] and (low>high[2] or high<low[2]))? wrb[1] : na
plot(hg, title='HG', linewidth=4, color=black, offset=-1, style=circles)
plot(wrb, title='WRB', linewidth=2, color=aqua, style=circles)