Hello!
As in the title; is it possible to get the name of the attribute in the attribute itself, such as { Hello = "${thisAttr}, world!"; }?
Thank you kindly for the help!
You can use lib.genAttrs:
lib.genAttrs [ "Hello" ] (name: "${name}, world!")
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Yes, but each of my values are different; I’ve decided to mapAttrs over everything and make the values functions, as suggested by u/balsoft on Reddit. But I always did love genAttrs! 
mapAttrs requires you to pass a set, and if your values are functions, then you’ll have to have some sort of dummy value in the set. Unless you mean that your set will be something like { "foo" = (blah: ...); }? (But then they’re all different functions, why not just hardcode the values, why the dynamic key inspection?)
What’s your end goal here, if I may ask?
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Basically, I’m forgetful, and I want to use the nixosConfigurations flake attribute, but I don’t want to keep repeating the names; using a function I can just do something like hostId: { config, ... }: { ... } to set the networking.hostId value!
Maybe it’d be better to just define a shortcut option for the full name, or are you trying to define all of your host IDs in one place?
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Actually, I just realized something: I pass in the hostname with specialArgs; I don’t need anything else! 
Sorry; thanks for reminding me!