Quantile function of the gamma distribution

How do I get the quantiles similar to R (qgmma(.)) of the gamma distribution in Rstan?

by using gamma_p?

I don’t know about this function, how do I use it?

Are you aware of the Stan Functions Reference here: 3.13 Combinatorial functions | Stan Functions Reference ?

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Yes, but I need something like: Gamma distribution quantile and inverse quantile function