Exponential forecasting based on two data points

Hello,

I have a data set (please see attached), where I know the number of aggregated units (N=200) at the end of the forecast (month 36), but I would like to forecast the aggregated number of units in each month before that (months 1 to 35), assuming a ramp up period - so a non-linear exponential curve

Is it possible to structure this where I can change the following elements in the assumptions tab:?
1) the duration of the forecast
2) how aggressive the ramp up period is

Any advise would be much appreciated.

Many thanks!