By default you can use Fibonaci numbers to estimate and write to story points fields. From version 1.1.4-AC the app supports other poker deck types such as T-shirt deck and custom deck.
T-shirt size deck
There is a default T-shirt sizes mapped with fibonaci numbers for you to use. Jira system admin can edit the default mapping in the app configuration. Go to Admin → Manage apps and find Agile Planning Poker then Configuration
When creating game the user can choose T-shirt size deck along with Fibonaci and custom deck
Custom deck is the most flexible way to define your own poker deck. In the game select “Custom” in Deck type
Define you deck with the label and associated story points.