Hi @Elian_Faggion - I was excited to see your Pack in the gallery, very cool! Unfortunately it’s a known limitation that the builder UI for a action formulas only supports one or two varargs. While more varargs are possible in the Formula editor, they cannot be exposed in the builder UI.
And to be clear, adding more varargs would add them to the existing set, not create a new set of key/value pairs. It’s only possible to have a single set of varargs.
While the UX isn’t as nice, the best workaround we have for creating additional sets of varargs (if that is your goal) is to have an optional string parameter that expects a JSON value returned by a helper formula. You can learn more about that approach in this other post: