Create a Custom Template
If you wish to create a custom template you can take a look at the default template in [app-directory]\Resources\TechPackTemplates\default. Your own template should resides in a separate directory under %USERPROFILE%\AppData\Local\Browzwear\common\TechPackTemplates. The active template can be set in the Preferences dialog.
Create a Custom Generator
You can integrate your own Tech-Pack generator into Lotta / VStitcher, by changing the Tech-Pack Processor executable path in the Preferences dialog. After choosing your generator, each time a Tech-Pack will be created, your executable will be called with the following command-line:
<your-executable> <tech-pack-directory> <template-name> <language-code>
Where the arguments are as follows: tech-pack-directory: The full path to the exported Tech-Pack directory (the one where output.json is) template-name: The folder name of the template set in the Preferences dialog. If you do not need templates in your own generator, you can just ignore this argument. language-code: The current language setting of the active user.