The Kanban method is described by the following foundational principles:
Start with what you do now
Agree to pursue evolutionary change
Initially, respect current roles, responsibilities, and job titles
Encourage acts of leadership at all levels
The four principles make it clear that the Kanban method is not a process in itself to just put in practice, it's a method to drive improvement and it starts with the process you already have. Bullet 1 and 3 say clearly to not make any changes neither in the process nor in the roles, initially. Bullet 2 and 4 set your mind to involve everyone to take small steps of improvement that will be permanent. Kanban is not a destination, it's a direction and wherever you are, you can always apply these principles.