variables defined in group_vars cannot be used as arguments when calling roles in a playbook.

Hi,
I want ot call the same role several time with different parameters in a playbook.
the variables I use are a dictionnary defined in group_vars.
I cannot use these variables defined in a group_vars file when listing roles in a playbook.
Is it a normal behaviour? How should I do in order to achieve it?
Thanks,
Regards.

group_vars/all

I have eventually found out what was wrong.
The double {{ }} and the double quote were missing in the playbook.yml, I didn’t notice at first.

playbook.yml