List Field Names of a Catalog Item

Hello,

If I know the sys_id of a Catalog Item (sc_cat_item table), how can I list all the fields of that item using a script?

Many of our service request forms are incompatible with Virtual Agent. What I want to do is create topics that can help users to fill out a form. They would select a field name they need help with, then VA would give them (hard coded) instructions on how to fill out that field.

Thanks.