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Problem:
You are trying to translate Gutenberg templates (both archive and single) for your site and encountering a JSON error when attempting to create translations directly in the backend.
Solution:
We recommend not creating a different template for each language. Instead, use Translation Management to translate the template from your site's default language. Please follow this guide for detailed instructions: Translating sites that use full site editing.

If this solution does not resolve your issue or seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should the problem persist, please do not hesitate to open a new support ticket for further assistance at WPML support forum.