Use Custom Fields to add JSA questions.
Create a new custom field by clicking 'Settings' in the right-side menu in your account.
Open the 'Custom fields' tab.
Click '+ Add job field' under the 'Job' heading.
Enter the field name and choose the type of field.
As an example, you may want to call the field 'JSA Survey' and choose 'Multi select drop down list' as the field type. This the Scheduler or Admin can pick from a list of potential hazards, and select more than one if necessary.
Another option for the field type could be 'Text area' -- this will allow Schedulers and Admins to enter any information without restrictions.
Just in case, you could create two fields -- one where items can be picked in a list and another where users can enter notes.
Example of custom fields created for JSA questions -- a multi-select drop-down menu and text area for notes.