When trying to add Hazard Assessment question in a form template, it is not in Question Type drop down list.
There is no Hazard Assessment published yet. You might have a lot of Hazard Assessments in Draft status and need to publish at least one Hazard Assessment before the option shows up in Question Type.
Click on the edit icon beside one of your Hazard Assessments that is in Draft then review and Publish it. You will see Hazard Assessment option in the drop down list for Question Type after that.