Before you dismiss it as 'not a language, people have argued that it is. And you can definitely program stuff in it, and so that surely makes it a language
Excel can import and parse JSON, it's under the "Get Data" header. It doesn't have a direct GUI way to export to JSON, but it takes just a few lines in Office Scripts. You can even use embedded TypeScript to call JSON.stringify.
Before you dismiss it as 'not a language, people have argued that it is. And you can definitely program stuff in it, and so that surely makes it a language