Help me edit NodeJS App

I'm looking for someone help me edit/develop nodejs function about munipulate the roulette result in my nodejs app. Now it's random result but I want it to hold 5% from total rollover and current game rollover like the picture attached. . So after this success we will always hold the 5% profitable from total rollover. Please see the attached image and the example detailed below to understand it. Example RTP Calculation: -> If total profit is 50000 (over 5%), and all game rollover and the current game is only 100,000 the result will be random normally. -> If total profit is only 4500 (<5%), and all game rollover and current game is 100000 we will need to munipulate the result to hold the profitable side. For more information please contact me.