i have a grouper "by fix version(s)" for epics:

I have got something like this:
abc-1.0.0
-epic 1 summary, duedate: 25/jan/19
-epic 2 summary, duedate: 05/feb/19
cde-1.0.0
-epic N summary, duedate: 01/feb/19
-epic T summary, duedate: 03/feb/19
The max due date for version is:
abc-1.0.0 - 05/feb/19
cde-1.0.0 - 03/feb/19
And I need to sort this groups in my structure by this version's due date to get this:
cde-1.0.0
-epic N summary, duedate: 01/feb/19
-epic T summary, duedate: 03/feb/19
abc-1.0.0
-epic 1 summary, duedate: 25/jan/19
-epic 2 summary, duedate: 05/feb/19
how can I do this?