These articles explain very well how you can use Compodoc inside your project :

Alfredo Perez

https://medium.com/@alfredo.perez.q/publish-angular-library-documentation-created-with-nx-using-travisci-and-github-pages-27854598239c

Ionic Academy

https://ionicacademy.com/ionic-code-documentation/

They also created a 10" video :

Angular Training