The World Exporter is used to export Bedrock worlds into the .mcworld format, as well as gather up any packs which are installed.
Put the Python script into the com.mojang folder and run it. Enter in the display name of the world. When you are prompted to install add-ons, drag the add-on files into the Python terminal to get the full file path. Your .mcworld file will be created in the "World Exports" folder.
The World Exporter requires Python 3.9 or newer.