Moveit MoveGroupInterface C++ constructor with robot description and namespace

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I try to learn MoveIt C++ interface.

In MoveIt Python interface, we can define namespace and robot description name

iiwa_group_name = "iiwa_plan_group"
self.move_group_joints = moveit_commander.MoveGroupCommander(iiwa_group_name,ns=self.namespace,robot_description=self.robot_description,wait_for_servers=10)

But In C++ Interface, It seems not possible. In tutorial from MoveIt official page, the movegroup is defined as following way.
https://ros-planning.github.io/moveit...

static const std::string PLANNING_GROUP = "panda_arm";
moveit::planning_interface::MoveGroupInterface move_group(PLANNING_GROUP);

When I look at the API of MoveGroupInterface class, It seems that there is no constructor availabe to define namespace and robot description. http://docs.ros.org/en/noetic/api/mov...

How can I fix this problem?
Thank you