If you download the official ISACA tool or a derivative template, you will notice a specific architecture designed to calculate the "Capability Level."
If you are building your own or looking for what to include, here is a structured outline of the essential components: 1. The Assessment Framework Cobit 2019 Maturity Assessment Tool Xls
Leveraging the COBIT 2019 Maturity Assessment Tool in Excel: A Strategic Approach to IT Governance If you download the official ISACA tool or
: Strategic advice on which processes to improve first, based on their importance to enterprise goals (e.g., APO01 for IT strategy or EDM02 for risk). Stakeholder Analysis : Mapping roles and responsibilities using the COBIT 2019 RACI Chart Visual Dashboards Cobit 2019 Maturity Assessment Tool Xls