How can I sum values out of a table grid and show the result on a dashboard?

[Niklas Blumenthal]

Hello,

is it possible to sum values out of a table grid and show the sum on a dashboard?

In the past we added up the values of a custom field with a gadget.

Is it possible to extract specific values out of the table grid with JQL?

 Thank you for your help in advance,

Niklas