Hi Matteo,
at this moment the component seems to not be updated, it does not include the API Key input parameter.
Any component available on the Add-Ons store are freely customizable by users so if you want, you can refer to the official Google documentation and implement the missing API Key management.
To create or edit custom component you can refer to these articles:
https://my.webratio.com/learn/learningobject/how-to-define-custom-components-v-72
https://my.webratio.com/learn/learningobject/how-to-debug-the-code-of-a-custom-unit-inside-the-web-application
I hope this will help you.