How to build coefficients on TM 2, 3, 4 and so on using the Poisson distribution?

Question

Mathematics

The question is:
Suppose we want to predict our chance for TM 2.5 in a match using the Poisson distribution in football, for this we need to take and add up all the probabilities of scores 0-0, 1-0, 0-1, 1-1, 2-0 and 0-2.
My question is: how to predict your chance in football on TM 2? (because if it is 1-1, 2-0, 0-2 there will be a return of the bet and the odds will be less for this bet, since there is insurance)