This has come up a few times in various ways and for various reasons – but they all come down to the same basic requirement:
Add a simple API to read/write values from/to a local file
The file would support storage and retrieval of test case/suite values across time, between runs.
I, personally, would favor a JSON file. But XML would work, too.
In addition, if GlobalVariables and TC variables could be populated from a related API, drawing their values from the same file, that would be of great benefit, also.
For further information, see this thread: