Jira Integration - Count Jira issues created within set time

Hey there

We had set up the Jira Integration correctly and it's working as expected.
And we have Jira issue status sync to a ticket field "Dev status".

for example, we have 3 status 

1. Backlog
2. WIP
3. Complete

 

Now, we're trying to count a metric: the number of Jira issues created from Zendesk via App(Integration).

I've set up below standard calculated attributes and hope to filter by it however it doesn't seem to be working. (I even tried with the ticket field ID)

Any thought or suggestion to achieve this would be appreciated!

 

IF ([Changes - Field name] = "Dev status"
AND [Changes - Previous value] = NULL
AND [Changes - New value] = "Backlog" ) 
THEN "True" ELSE "False"
ENDIF

IF ([Changes - Field name] = "Dev status"
AND [Changes - Previous value] = "-"
AND [Changes - New value] = "Backlog" ) 
THEN "True" ELSE "False"
ENDIF