Using limit price in position builder

HI All,
I am trying to build a strategy where I get the strike for selling CE and PE using formula.
After getting the strike I want to sell the CE and PE at a price which is 0.5 rupee less than the low of the the selected strike 15 min candle at 09:45. I have tried using limit price in the position builder but i cannot pass the calculated strike to the formula. Any help on this would be greatly appreciated.

Hi did you get any solution for this?