Can we add locations to a given Google map temporary ?

Can we add locations to a given Google map temporary ?

Can we add locations to a given Google map temporary ?
Which means I have a simple web page with a Google map embedded into it. I
want to add 2 schools into that map once I click a button in that web page
(assume i have the GPS coordinates and necessary details of them).
I am not referring to the Markers in Google map.
Thanks,