Of course, composer will tell you when installing Devel anyway. But in case you missed it, making Kint() output more pretty and handy is easy one line of code.
Just use this:
composer require 'kint-php/kint'
Also, if you want to dig deeper into a drupal, use those:
composer require 'kint-php/kint-twig'
Which will provide you with d() and s() functions in twig templates
composer require 'kint-php/kint-js'