Hello, Youssouf Ahmed
Welcome to Microsoft Community.
I realize that you want to create a master task list in Microsoft Loop, and I understand how you feel.
You can add a Checklist of task:
Type “/” and then select Checklist.

If you complete a task, you can check it off.

Additionally, you can use the Loop templates:
In the page list, click the plus button to add a page.

Then select a template in the Template Gallery and click "Use template".


You can edit the template and make it meet your needs.
I hope my reply helps you. Feel free to post back if you need further assistance.
Best wishes,
Lucia Wu - MSFT | Microsoft Community Support Specialist