How to make a slider categorical using Form in builder


I’m a beginner in using Psychopy and am trying to incorporate several “Form” elements (questionnaires such as STAI, for example) into my task. The slider option seems to be one which Pavlovia recognises as cross-compatible (when uploading to the Pavlovia platform) but I’m having trouble telling the builder how to make the options categorical (for example i’m using a likert scale and don’t want to give participants the option of selecting a number between 1 and 2, but rather either 1 or 2)

Any idea how to solve this? Or if not, is there a way to get Pavlovia to accept the “radio” scales I am using in my Form questionnaires?