Mathcad Prime COM API to automate workflows

Experts, 

I am exploring how to leverage the Mathcad COM API to automate for different  workflows:

For already existing worksheets how can I start accessing worksheet content and extracting variables and their calculated values for further processing or integration with other applications (this can be any application). Also, Is it possible to generate Mathcad worksheets and reports from scratch using the API, including creating and populating both text and mathematical regions through code?

I would appreciate any recommendations, workarounds, or alternative approaches for achieving these automation requirements using the Mathcad COM API or other available methods.