Once you load the inputs into the application with PPI license, the price for the inputs will pop-up in the upper-right corner of the application.
If you want to know the cost before importing the inputs, you can use…
https://dev.epicgames.com/community/learning/knowledge-base/zekZ/realityscan-how-to-calculate-the-amount-of-ppi-credits-needed-for-licensing-the-inputs