TransformBroadcaster as member of ROS2 Node

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What is the proper way to create a tf2_ros::TransformBroadcaster inside a rclcpp::Node?

I am trying to create a TransformBroadcaster as a member of a ROS2 node, i.e. constructing from this. So far, I am constructing the ROS2 node member tf_broadcaster from a shared pointer to this:

MyNode::MyNode() : Node("my_node", "node_namespace", true) {
    // in header: std::unique_ptr<tf2_ros::TransformBroadcaster> tf_broadcaster;
    tf_broadcaster = std::make_unique<tf2_ros::TransformBroadcaster>(rclcpp::Node::SharedPtr(this));
}

This seems to work in general, e.g. I can publish my transforms. However, I get a double free corruption error when the node is deconstructed, because the node is deconstructed a second time when shared_ptr goes out of scope.

Neither this->shared_from_this() (error at construction: terminate called after throwing an instance of 'std::bad_weak_ptr') nor std::shared_ptr<rclcpp::Node>(this) (error at deconstruction: free(): invalid pointer) allow me to create a shared pointer of this.

Wouldn't it be easier, if the rclcpp::Node would inherit the transformer methods from a TransformBroadcaster class instead of instantiating it manually? E.g. class MyNode : public rclcpp::Node, tf2_ros::TransformBroadcaster {} and then just call this->sendTransform(tf);.