Hi markalves,
You can try to add some hidden fields with the values of your additional parameter
as <th field="param1" data-options="hidden:true ..
If you cannot set the values for these parameters within the datagrid data
you can use calculated fields, assuming that this parameters values are changing
at the same time with the values in edited fields.
https://www.jeasyui.com/tutorial/datagrid/datagrid15.php