Priors for functions of parameters

[dweindl]

Often models are parameterized in terms of rate constants k_f and k_r for which it's hard to provide a prior as opposed to equilibrium constants K = k_f / k_r. Therefore, it would be great if one could specify a prior for k_f / k_r (instead of changing the model parametrization).

Not sure how to best specify that in PEtab. Any ideas?