How to add an animation suffix with triggers/abilities

[StangtennisGuru]

So basicly I have a model that has two different sets of animations and I preferably want to be able to switch between them without using defend or a morph ability. What I'm looking at mostly is the 'Upgrade' animation suffix that is added to Mountain Giant when he wields a tree, only asfaik there's no way to use that without targeting a tree which limits it a whole lot. It seems you can also type in animation suffixes in the 'Art - Required Animation Names' and that seems to work, but ofc it's one of the fields you can't access through triggers.
Is there any other way to add 'Upgrade' or a similair animation suffix through an ability, upgrade or triggers?

 

[Duckfarter]

Animation - Add/Remove Unit Animation Tag

 

[StangtennisGuru]

Animation - Add/Remove Unit Animation Tag

Ahh thanks! Nice with a simple solution for once, I only looked in the unit field triggers.