[Macros] Is there a way to use the same roll result twice on a macro?

Hi all Basically I am making a Macro to represent the 5e d&d spell "Life Transference", which for those who aren't familiar with the spell it basically rolls 3d8 in damage, and then awards double that damage in health to another target. So I wanted to make a macro that rolls the damage, then elsewhere in the macro it shows the result(x2) as the heal amount. Something like "You take [[3d8]] damage, and heal [[previous roll*2]]." I know I can just simply make a macro that rolls 3d8 and then double the amount in my head but I want to make a swish looking macro for ease. Is there a way to do this or would this require api functionality?

You can't use a roll inside inline rolls twice but you can reference rolls for display multiple times. This allows you to show a roll that has been nested inside another. You take $[[0.computed]] damage, and heal [[ [[3d8]]*2]]. More details on Reusing Rolls on the wiki

That is perfect thank you so much! Knowing how that works also helps with some other Macro ideas I had.