label-studio/examples/references/config.xml

Data Labeling Tool that is backend agnostic and can be embedded into your applications

<View>
  <Text name="text" value="$text"></Text>
  <Choices name="validation-label" choice="single-radio" toName="text">
    <Choice value="Missing words" alias="missing-words"></Choice>
    <Choice value="Valid" alias="valid"></Choice>
  </Choices>
</View>