abilityActivationTypes_unchained: {
    action: "PF1.Activation.action.Single";
    aoo: "PF1.Activation.aoo.Single";
    attack: "PF1.Activation.attack.Single";
    free: "PF1.Activation.free.Single";
    hour: "PF1.Activation.hour.Single";
    minute: "PF1.Activation.minute.Single";
    nonaction: "PF1.Activation.nonaction.Single";
    passive: "PF1.Activation.passive.Single";
    reaction: "PF1.Activation.reaction.Single";
    special: "PF1.Activation.special.Single";
} = ...

This describes the ways that an ability can be activated when using Unchained rules.