Dynamic Surplus or Deficits?

I already use custom dynamic macros, so having custom dynamic calories would be great since my activity varies by the day and I don't want to program a set number of calories. Is there a way to program a custom dynamic surplus for daily calories? I'd like to have a minimal change from maintenance, say 75-125 calories per day instead of the 250 that comes with +0.5 lbs gain per week.

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