How can I select the specific database in MongoDB on App Platform?

So basically I created a cluster mongodb database and then I attach the database into my app.

In the Environment Variables I notice that was added CA_CERT=${db-mongodb-sgp1.CA_CERT} and DATABASE_URL=${db-mongodb-sgp1.DATABASE_URL}

But the problem is that DATABASE_URL it’s connection string pointing to the admin database, and I want to use another database app.

`xxx.mongo.ondigitalocean.com/admin?authSource=admin&tls=true"``

There is any way to connect to app database and keep using admin as the authSource?