Thanks for catching this one. I'm not certain why it would be missing from the templates.
To add the articulation do the following, after adding a note select the Articulation Tool > select the note you wish to add the articulation to > click Create (in the lower right corner of the box) > Select Main > scroll through the available articulations and select #122. You may also repeat for Flipped and set Options and Positioning as desired.
To add the articulation do the following, after adding a note select the Articulation Tool > select the note you wish to add the articulation to > click Create (in the lower right corner of the box) > Select Main > scroll through the available articulations and select #122. You may also repeat for Flipped and set Options and Positioning as desired.