Listing active themes and page templates available in each theme in a multi site

Hello,

I am trying to get a list of all the sites in my multisite network and display active theme, templates available in that theme and number of pages using each template. Currently: I can do this for each site individually using get_page_templates and get_pages function.
Expected Result: I want this information to be displayed at a single place for usage and maintenance purposes.

Thanks for your time!