What is the best way to inject certain things to show in Symfony?

Question

symfony

Hello everyone,

I am faced with the task of changing the View coming from the vendor bundle.
that is, you need to add something to the content generated by the bundle. And this block must be dynamic. And its logic does not depend on the Bundle Controller.

How it is better to implement it?

On the Symfony documentation in the Twig section, there is such a thing as rendering a controller, but I read or heard somewhere that this is a bad choice. If you also consider why and what alternatives do I have?
https://symfony.com/doc/current/reference/twig_ref...