Historical data display



Hi there,

we are evaluation eazyBI to use it with Jira Service Desk and one of our tasks is to create a report on a weekly base. This shall display statuses in different categories:
cat1 age up to 2 days
cat2 age up to 7 days
cat3 age up to 14 days etc.

Now we want to display how many tickets in status A in week 15 are in the different categories
This then shows over the time per week the change in the age structure.

Can this be done at all and if yes how would I start? I tried to create an own customfield within the advanced settings but this field does not show up anywhere. So I guess I am doing something wrong. I can recalculate a Jira calculated field using the advanced setting and that then shows up correct, so I believe I understood how to use the settings.

Thanks for any input,