Although more details are required the following ideas could help you achieve what you are looking for:
1. Setup a board as a Checklist. Items = Tasks, Columns = Task details (status, assignees, etc.). This needs to become a template.
2. Use the ‘Approval column’ for stakeholder validation. Use status columns or a “People” column to assign tasks to specific stakeholders. You can also use sub-items or linked boards if tasks require multiple validations by different people.
3. Use automation: With automation you can trigger notification only to the assigned stakeholder (which could be added inside a People column)
You can also break this process into multiple steps and use the Button feature to trigger the next step in the process with a click.
You can also create dashboards and views to help you monitor task completion and stakeholder validations in real time.
There are different ways and ideas to achieve this, it is doable, but you need to work on your worfklow also in my opinion and how you guys work internally, not just try to implement it directly on Monday.com. Starting form workflow mapping can help you understand your process and streamline it when moved to Monday.com avoiding unnecessary actions.