Trailing pending order

Trailing pending Order EA

Is there somewhere already a Trailing Pending Order EA ?

It should be something that is opposite of a Trailingstop EA.

Example - If price is 2.0000 and I put a pending buy trailing of 20 pips. When If price goes down 50 pips, my pending buy order should also move down to 1.9970

When price moves back to 1.9970, my entry will be triggered.

Thanks for your help