@babel/plugin-transform-json-strings enables the transformation of lone Unicode characters U+2028 Line Separator and U+2029 Paragraph Separator to valid escape sequences within JSON strings. This addresses compatibility issues with older JavaScript engines that may not properly parse these characters directly within JSON. The plugin enhances cross-browser compatibility by ensuring consistent JSON parsability, especially crucial when working with data sourced from diverse environments. It helps avoid parsing errors and ensures reliable data handling across different platforms.