You know what - You actually helped me a lot. Thank you so much!
I solved my issue - if bubble doesn’t want me to create Roles and Goal together with tasks for unknown reason - screw it.
I set tasks_role and tasks_goal to role and goal datatype, set both dropdowns to evaluate to the same, and hidden them, if the parent group task is empty.
Now I can create tasks with title, description, and Eisenhower quadrant and then set goals and roles by editing a task.