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Yes. To do this simply edit the Enum "CombatDirections" in the Blueprints folder. Here you can press the "New" button to create a new entry:

Now you can add this pin in the Animation Blueprint. A blending between different poses for different guard stances is done with the "Blend Poses" node. This node can blend different poses based on the "CombatDirections" enum. The Animation Blueprint holds a variable of this type which is set by the "BPC_CombatCore" (in the "UpdateCombatDirection_Broadcast" event).

The newly created Enum entry does not appear automatically in the Animation Blueprint blend node. It has to be added manually. Right-click on the node and select the new entry under the category "Add pin for element".