Hi Sawal,
Sorry for the silence; I’ll raise this issue with someone that has more knowledge of the slider component than I do. I do have something else that might be useful for you. The experiment below illustrates how to embed form.io forms inside of PsychoJS. This way you’ve got a free and open source system for surveys at your disposal that rivals Qualtrics in it’s feature set.
See the README for instruction on how to plugin your own questionnaire.
Best, Thomas