PHASE 1: Support standard line item properties that are added to products through input properties. This covers most use cases where themes and some apps add line item properties. PHASE 2: Add a 'Step type' for 'Line item property' to allow fields for personalisation like 'Personalised name', 'Engraving', or 'Gift message' This would be a Biscuits native way and would include some nicer UX to match the rest of the bundle form. These options could be presented as: Text, Textarea, Checkbox, Buttons, Dropdown values The values would be captured as line item properties on the bundle items.