How to implement incremental authorization

[manhbui21]

As the library described:

Once a user is logged in an access token can be requested for the scopes we specified in GoogleInitOptions.scopes, you can then reuse this access token to make calls to google apis

This mean we can only request access token with a fixed set of scopes. Is there any way to implement incremental authorization that allows me to request access token for Calendar scope after logging in, then another access token for Drive scope when I need it later?