How can I get values from nested structures?

service, err := cloudrun.NewService(.....)
if err != nil { return err }
ctx.Export("gateway-metadata", service.Template.Metadata())

This results in error

applier must have 1 input parameter assignable

<http://github.com/pulumi/pulumi-gcp/sdk/v3|github.com/pulumi/pulumi-gcp/sdk/v3> v3.0.1
<http://github.com/pulumi/pulumi/sdk/v2|github.com/pulumi/pulumi/sdk/v2> v2.0.0