Asp.Net Core : Get the value after siding in DbContext?

Question

I want to seed a default value in the database...These values ​​include a role and a user. How can I take the role value after seed and add it to the next seed which is adding the user?Is this possible or not?

Seed Role :

modelBuilder.Entity<Role>().HasData(
            new Role { RoleId = Guid.NewGuid(), RoleName = "User" },
            new Role { RoleId = Guid.NewGuid(), RoleName = "Admin"}
        );

Seed User :

 modelBuilder.Entity<User>().HasData(
            new User { UserId = 1,RoleId = ?}
            );

Actually I want to get the Admin role ID and add it to the RoleId field in the User table?