Google Maps: How to show a list of drawn objects?

Question

Google

How to display a list of user-drawn objects on a google maps map?
Example:
Go to https://www.google.com/maps/about/mymaps/ , draw a pair of triangles. On the left we see a list of drawings.
I need the same socket in my map.

Answer 1

when creating an object, put it in an array, how to get a panel with objects on the left, I think you can guess.