Access Jira system fields via Jira gadget

[Nuwan]

I added jira "Two Dimensional Filter Statistics Gadget" to my dash board but I cannot access the "Affects version" field via this gadget.

is there any special reason for this issue or how can I access this field via Two Dimensional Filter Statistics Gadget?.I need to get this field in XAxis or in YAxis.

I noticed that in this gadget list down only jira custom fields. is there any reason for this gadget avoid the jira system fields.

[Nelson Rosenberg]

I have the same problem. Can anyone share some light into this?

Thanks a lot