message: Store markdown as object containing extension-array in item._text
diff: @@ -98,7 +98,7 @@ const Question = (props: QuestionProps): JSX.Element => {
  url: IExtentionType.markdown,
  valueMarkdown: newLabel,
  };
  - const newValue = updateExtensionValue(props.item._text, markdownValue);
  + const newValue = { extension: updateExtensionValue(props.item._text, markdownValue) };
  dispatchUpdateItem(IItemProperty._text, newValue);
  // update text with same value. Text is used in condition in enableWhen
  