So there is no native connector for Google DataStudio in any Informatica product. PowerCenter specifically does not support cloud based data sources in general so you most likely will not be able to connect to it. Being a reporting tool not sure what you would get out of it but it may have a JDBC or REST API layer both of which PowerCenter does not support. Your only option would be either SOAP or ODBC which I highly doubt data studio has.
I am not sourcing from cloud services. But, I have this URL which points to GoogleDataStudio in which I have the data to read it. Hope this helps.
My only challenge right now is - I am not sure what/how I need to connect to this source to read data
A URL would suggest a REST api. Powercenter does bot support rest calls. Some will point you to the http transform but i highly doubt it will work.
if you search for powercenter rest api you will find some KB articles detailing how to do it.
You can refer below links for your reference