Adding a New Roll20 Dice Specification: Dice that explode "downward"

I'd like to see a dice mechanic added to where if a dice roll is low enough, the system will roll again and subtract the new roll from the original roll.  Further, it can be combined with the die rolls that explode normally that already exists. eg Exploding Downward:  /r d100!d<5    rolls a 3; rolls again and gets a 22; outputs "-19" rolls a 54; outputs "54" Exploding Down And Up:  /r d100!d<5!>95    rolls a 3; rolls again and gets a 22; outputs "-19" rolls a 99; rolls again and gets a 35; outputs "134"  rolls a 54; outputs "54"  rolls a 98; rolls again and gets a 97; rolls again and gets a 38; outputs "233"  rolls a 2; rolls again and gets a 97; rolls again and gets a 74; outputs "-169" rolls a 3; rolls again and gets a 2; outputs "1" rolls a 98; rolls again and gets a 2; outputs "100"

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