@francoisgriessel1802 A dding code to an HTML component is not a part of the Corvid product (which is what this forum is about). You will need to check the Google Maps documentation, and the provider of the script to find out how to get it work and how to adapt it to your needs.
You might find this example useful:
Multiple Markers in Google Maps
Embed Google Map on your site with multiple location markers , marker clustering, and custom controls using the HTML component.