Looking for Help, trying to connect an attribute modifier to a Macro

I'm very new to Roll20, and trying to build a Macro; I've made an Initiative Macro for my Ranger (2d20dl1 etc), and I want to be able to connect my Dexterity Modifier to it, preferably without just making a secondary attribute that I'd have to manually change. Is that a possibility? Currently my Dexterity Attribute is just my Dexterity, flat, which I can't really use for anything of importance. Any suggestions for working this out? Just connecting the Dex Mod to a Macro/Ability.

I think I might've figured it out: does [[2d20dl1 +@{Dalyn Darkwalker|dexterity_mod} ]] look correct?

Yes, or substitute the character name for selected if you want to make it more generic.