Hey @cho04083 how are you?
I think the best option to do this is Python. First of all, check if you have the “Python Editor Script Plugin” enabled. Once you have it, you will be able to use the node “Execute Python Command” to execute the corresponding script and export the data after you stored it beforehand.
This method provides more flexibility than others you can find as plugins.
But if you want to try it with plug ins as well, you can test VaRest which is free and does a great job exporting JSON files.
I hope this helps!