Custom Roles class for ApiAuthorizationDbContext

For the past 2 days I have been trying to get ApiAuthorizationDbContext to set a custom IdentityRole. With IdentityDbContext this could be done as follows:

public class ApplicationDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, Guid>
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }
}

In the blazor project template the declaration of the ApplicationDbContext is the following:

public class ApplicationDbContext : ApiAuthorizationDbContext<ApplicationUser>
{
    public ApplicationDbContext(
        DbContextOptions options,
        IOptions<OperationalStoreOptions> operationalStoreOptions) : base(options, operationalStoreOptions)
    {
    }
}

How can I do something similar with the ApiAuthorizationDbContext. I can not find this kind of support from the ApiAuthorizationDbContext class.

Thanks.