If you are interested in posterior predictive checks and the sometimes called Bayesian p-value you should take a look at arviz.plot_bpv — ArviZ dev documentation and arviz.plot_loo_pit — ArviZ dev documentation.
If you are interested in posterior predictive checks and the sometimes called Bayesian p-value you should take a look at arviz.plot_bpv — ArviZ dev documentation and arviz.plot_loo_pit — ArviZ dev documentation.