ros2 bag ignored topics

edit

Hi, I'm trying to play a rosbag but as one of the topics is from custom interfaces, I get the following error

$ ros2 bag play [folder]

[INFO] [1652794310.845166862] [rosbag2_storage]: Opened database '**' for READ_ONLY. [WARN] [1652794310.850144653] [rosbag2_player]: Ignoring a topic '/topic1/custom_interface', reason: package 'custom_package' not found, searching: [/opt/ros/galactic]. [INFO] [1652794310.853605010] [rosbag2_storage]: Opened database 'rfm_associations_ros2/rfm_associations_ros2.db3' for READ_ONLY.

How can I add them to my path so that those are found by ros2 bag? I have built them in another ros package