Hi Guillermo Huidobro,
If you want to add scripts (to add new AngularJS directives or other libraries) you should add a customScripts property to the app/tasklist/scripts/config.js file
See below links
https://docs.camunda.org/manual/7.4/webapps/tasklist/configuration/#custom-scripts
https://groups.google.com/d/topic/camunda-bpm-users/HxiwfDKEOlY