Is there a way to conveniently roll a "Triple" advantage?

So currently theres the advantage feature which when toggled makes you roll 2 dice and pick the highest(For attacks this is 2d20s etc.), is there a way you could set it to roll 3 dice and pick the highest? Theres some feats in 5e that makes it so that when you roll with advantage you get to reroll one of the dice, making it effectively a "Triple" advantage, and I was wondering if there was a convenient way of configuring this without fancy macro shenanigans(Because it seems like a pain to setup macros for all my advantage rolls)

I think the Shaped sheet has a double advantage/disadvantage option built in.  In the OGL, you're probably better off just rolling again, or throwing another d20 out there to see what's better.

Well, a simple [[3d20k1]] should do what you want to do.