No, VSCode uses jsonc, not JSON5. They are very different, e.g. allowing trailing commas is an explicit design goal of JSON5, whereas in jsonc they are frowned

No, VSCode uses jsonc, not JSON5. They are very different, e.g. allowing trailing commas is an explicit design goal of JSON5, whereas in jsonc they are frowned upon (generates a warning, and was illegal at one point). jsonc is basically JSON + comments and nothing more, IIRC.