Connecting with Cloud spanner Database

Hi,

We are planning to use strapi for our CMS and would like to connect the strapi with the cloud spanner database.
The spanner database doesnt have an Host address , username and password. Instead uses the connection string and cloud credentials.
Can you guide me on how to connect the strapi with the cloud spanner database (the connection string that is required)

Thanks in advance

Regards
Srinivasan