When you start using a collaboration tool like monday.com, one of your main objectives should be to move all the work and communication happening outside into monday.com. You can foster initiatives to bring information that you or your team have created in spreadsheets to monday.com. One of the tools that can be incorporated is a RACI matrix (Responsible, Accountable, Consulted, Informed).
A RACI can be used to define and share team roles and responsibilities upfront. It will help you improve performance and identify and head off potential difficulties during a project. Using the monday.com features you can also link the activities to processes where the responsibilities are described or to the projects where the activities take place.
Here after there are a couple of examples of RACI implementations:
At project level
The activities can be assigned at high project level with roles, departments or business areas.
At department level
You can list the activities within the department.
I hope it may serve as inspiration for creating a RACI with monday.com.