How to execute alternating roles in Ansible?

Question

I need to somehow loop over a list of variables and execute both of the below roles once for each iteration, on each iteration passing a variable to the role. For example

Answer 1

Loop over the Cartesian product of variables and role names:

vars:
  roles_to_include:
    - role1
    - role2
  values_to_pass:
    - 100
    - 101

tasks:
  - include_role:
      name: "{{ item.1 }}"
    vars:
      my_variable: "{{ item.0 }}"
    loop: "{{ values_to_pass | product(roles_to_include) | list }}"