code: def add_context(self, context, label=None):
          
  
          assert isinstance(context, dict)
  
          item = defaults["common"].copy()
          item.update(defaults["instance"])
          item.update(context)
  
          item["family"] = None
          item["label"] = context["data"].get("label") or settings.ContextLabel
          item["itemType"] = "instance"
          item["isToggled"] = True
          item["optional"] = False
          item["hasCompatible"] = True
  
          item = self.add_item(item)
          self.instances.append(item)
docs: Append `context` to model
  
          Arguments:
              context (dict): Serialised to add
  
          Schema:
              context.json