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Updating solution just in case anyone has the same problem. To import, we have to use.

from nav2_msgs.srv import LoadMap

Sample code for the service call

Class Service(Node):
    def__init__(self):   
        self.map_client = self.create_client(LoadMap,'/map_server/load_map')
        self.map_request = LoadMap.Request()
        while not self.map_client.wait_for_service(timeout_sec=10.0):
                self.get_logger().info('Waiting for service')

        self.send_request()

    def send_request(self):
            self.map_request.map_url = "../maps/my_map.yaml"
            wait = self.map_client.call_async(self.map_request)
            rclpy.spin_until_future_complete(self, wait)
            if wait.result() is not None:
                self.get_logger().info('Request was responded')
            else:
                self.get_logger().info('Request Failed')

This will send map data to /map topic that can be used to get the map data

Updating solution just in case anyone has the same problem. To import, we have to use.

Sample code for the service call

Class Service(Node):
    def__init__(self):   
        self.map_client = self.create_client(LoadMap,'/map_server/load_map')
        self.map_request = LoadMap.Request()
        while not self.map_client.wait_for_service(timeout_sec=10.0):
                self.get_logger().info('Waiting for service')

        self.send_request()

    def send_request(self):
            self.map_request.map_url = "../maps/my_map.yaml"
            wait = self.map_client.call_async(self.map_request)
            rclpy.spin_until_future_complete(self, wait)
            if wait.result() is not None:
                self.get_logger().info('Request was responded')
            else:
                self.get_logger().info('Request Failed')

This will send map data to /map topic that can be used to get the map data

Updating solution just in case anyone has the same problem. problem.
To import, we have to use.

from nav2_msgs.srv import LoadMap

Sample code for the service call

Class Service(Node):
    def__init__(self):   
        self.map_client = self.create_client(LoadMap,'/map_server/load_map')
        self.map_request = LoadMap.Request()
        while not self.map_client.wait_for_service(timeout_sec=10.0):
                self.get_logger().info('Waiting for service')

        self.send_request()

    def send_request(self):
            self.map_request.map_url = "../maps/my_map.yaml"
            wait = self.map_client.call_async(self.map_request)
            rclpy.spin_until_future_complete(self, wait)
            if wait.result() is not None:
                self.get_logger().info('Request was responded')
            else:
                self.get_logger().info('Request Failed')

This will send map data to /map topic that can be used to get the map data