TextInput add new lines in multiline mode

<TextInput
  multiline
  blurOnSubmit={false}
  onChangeText={(text) => {
    this.setState({ text });
  }}
  value={this.state.text}
  onSelectionChange={(event) => this.setState({ cursorPosition: event.nativeEvent.selection.start })}
  onSubmitEditing={(event) => {
    const { text, cursorPosition } = this.state;
    let newText = text;
    const ar = newText.split('');
    ar.splice(cursorPosition, 0, '\n');
    newText = ar.join('');
    this.setState({ text: newText });
  }}
/>