squat bar help

[DRDTRI]

hello:

I am looking for help with an efs that would alert me when the most recent bar-when volume divided into the range of the bar and compared with the previous two price bars, with the mathematical result being lower, will produce an alert like a circle above the price bar.

current bar volume/(hi-lo) < previous volume/(hi-lo) &

current bar volume/(hi-lo) < 2 periods ago previous volume/(hi-lo)

thanks