To achieve your goal of converting a Spine 3.6.53 JSON file to a 3.8.99 JSON file using the CLI, you can follow these steps:
Import the JSON into Spine 3.6.53: Use the CLI to import your 3.6.53 JSON file and create a .spine project file. You can do this with the following command:
Spine -u 3.6.53 -i /path/to/skeleton-3.6.json -o /path/to/skeleton.spine
Open the .spine file in Spine 3.8.99: Use the CLI to open the .spine project file you just created with Spine 3.8.99 and export it as a JSON file:
Spine -u 3.8.99 -i /path/to/skeleton.spine -o /path/to/skeleton-3.8.json -e /path/to/export-settings.json
Make sure you have the correct export settings in your export-settings.json file to ensure the JSON is exported correctly. This process will upgrade your project from 3.6.53 to 3.8.99 and export it as a JSON file.
