While for standard tasks the default mechanism for Rscript rendering of List & Label might be sufficient and convenient to automatically generate the png, jpeg or svg chart output from a Rscript on the fly, there might be situations where you simply desire more control.
List & Label has supported a number of text based export formats for quite a while. You can have XML, CSV and layout TXT export in different variants. That way, you can use List & Label as a convenient way to convert your data from one of the supported data sources to something you can use in other applications again. But one very popular format was missing so far that's been around for quite a while: Java Script Object Notation aka JSON.