I had to do something similar once with FRRs (firewall rule requests) as a F50. There is one official way of requesting a FRR. What that way is a matter of some debate. Theoretically you file a JIRA ticket with fqdn, ip/mask, port, protocol info. Anyways cutting a long rant short I eventually had to write a script to generate 100 SRC X 10 DST X 2 ports rules as csv pulled into a spreadsheet.

After a couple days it was assigned to an engineer for implementation and of course the first thing he did was unflatten it.