ICC for a beta_binomial model


Is there a way to calculate ICC equivalent for this model? I read a lot of posts on the forum, but I still don’t know which is the right method to use or if there is even one for non-Gaussian models. Could someone help?

brm.formula = brmsformula(formula = no_of_times_mother_carries|trials(no_of_times_mother_moves) ~ z.offspringAge + males_P_A +(1 + z.offspringAge | motherID), family = ‘beta_binomial’)