Simple to carry out: JSON-LD separates the markup from the HTML material, which makes it easier for developers to build and manage. I wouldn’t give A great deal weight for their suggestion. They are saying that "Structured data markup is most effortlessly represented in JSON-LD format", but I think it’s https://socialfactories.com/story4318927/a-secret-weapon-for-automatyczne-google-rich-snippets-json-ld-opengraph-seo