Future Stocks Data not available

Hi everyone, i am trying to fetch the historical data of a future stock of previous 15 month ohcl data because i want to calculate the rsi value of the future stock on the month timeframe. But it is not giving me data is just giving only of 2 or 3 month data. Am i making some mistake to get it or it is not the right way to calculate the rsi of a future Stock?

@Himanshu_GTS, Thank you for your inquiry.

At present, we only offer data for the actively trading futures contract. We recognize the importance of having access to historical data for analytical purposes.

Our team is actively working on making historical future data available. We will inform you when this feature is developed and pushed in our production environment.