how to model <Type> notation or UI parent/child notation

[Paul Allard]

I apologize if this is an old question.  It is not clear whether the search bar picked up on the <Type> syntax.

Part 1: Is <Type> notation shown in a UML Class Diagram?  

Type notation is used in many Java-like languages.  Here is a very simple example.  

List<Person> People = {Person person1, Person person2}; 

Where People is a simple aggregation of Person Classes/Objects.   There are more complex examples should this prove too simple.  

Part 2: In some UI languages Parent/Child relationships are shown as explicit parameters in the constructors.  Are these relationships shown in a Class Diagram?

Class Page {

  build() {

    return Scaffold( 

      child: MyCheckbox, 

    );

  } 

}

MyCheckbox is a distinct class where Page is composed of these subclasses.  Are these relationships shown in a Class Diagram?

I use a UML generator called PlantUML and DCDG which generates UML from code.  It gives me a test as to whether my code is meeting my expectations.  Currently the tool does not diagram these 2 types of relationships.  I wanted to submit an issue on these but was looking for some validation before I submitted the issue.    What do you think?