I was found this in google
in here you can create map makers.
.. like your school map
also it will save on google drive
i tried on sample
https://www.google.com/maps/d/edit?mid=1atUTuSY6aEWjv9kitsZMabJQL-NpWJDp&usp=sharing
OR https://www.google.com/maps/d/edit?mid=1atUTuSY6aEWjv9kitsZMabJQL-NpWJDp&usp=sharing
This is the websit :https://mymaps.google.com/
i hope this will useful for every app makers.