increase_governance_effect

increase_governance_effect = {
	# VALUE - The amount of XP added to the Governor trait/increased chance to gain the Governor trait
	save_scope_value_as = {
		name = governor_xp_gain
		value = {
			value = $VALUE$
			if = {
				limit = {
					exists = scope:task_contract
				}
				multiply = governance_task_contract_tier_value

				if = {
					limit = {
						$VALUE$ > 0
						domicile ?= { has_domicile_parameter = estate_governor_trait_xp_bonus_for_contracts }
					}
					multiply = {
						value = 1
						add = estate_governance_contract_bonus_value
					}
				}
			}
		}
	}
	# Double-check if you have the governor trait - If not, let's make sure you get it
	if = {
		limit = {
			NOT = { has_trait = governor }
			is_governor = yes
		}
		add_trait = governor
	}
	# If you have the trait, let's increase your XP for it
	else_if = {
		limit = {
			has_trait = governor
		}
		add_trait_xp = {
			trait = governor
			value = scope:governor_xp_gain
		}
	}
}

As written in game/common/scripted_effects/07_dlc_ep3_scripted_effects.txt.