How to create a Text widget with exactly two lines of text in flutter?

Question

I want to create a Text widget with exactly two lines of text even if text's length is too small or too large.

I can limit upper-bound of line count with maxLines like below:

Text(subtitle,
    maxLines: 2,
    style: Theme.of(context).textTheme.bodyText1?.copyWith(
        color: Theme.of(context).colorScheme.onSurface,
        fontWeight: FontWeight.w400,
    )
)

I saw some answers where it is suggested to use a SizedBox to fix the height of content. I didn't feel right to hardcode this value.

I am looking for something like lines in Android's TextView. What else can I do to achieve this in Flutter?

Update:

From the help of comments & answers below, I am using following code now:

String withExtraNextLineCharacters(String text, int count) {
  String nextLineCharacters = "";
  for (int index = 0; index < (count - 1); index++) {
    nextLineCharacters += "\n";
  }
  return text + nextLineCharacters;
}