How to call the onTap method of a built GestureDetector? - flutter

Question

I am using the flutter package AnimatedTextKit which displays some animated text.
(https://pub.dev/packages/animated_text_kit)
An AnimatedTextKit is a StatefulWidget and builds a GestureDetector :
#override Widget build(BuildContext context) {
final completeText = _currentAnimatedText.completeText(context);
return GestureDetector(
behavior: HitTestBehavior.opaque,
onTap: _onTap,
child: _isCurrentlyPausing || !_controller.isAnimating
? completeText
: AnimatedBuilder(
animation: _controller,
builder: _currentAnimatedText.animatedBuilder,
child: completeText,
),
);
}
I wrap the AnimatedTextKit into a Card, and also show a yellow triangle at the bottom of the Card when the text is fully displayed :
Card containing an AnimatedTextKit
When I tap on the text : it's fine since the AnimatedTextKit GestureDetector detects the tap. But when I tap on the yellow triangle just below, because I tap outside the AnimatedTextKit widget, the tap is not detected, which is normal.
Is there a clean way to make a tap made anywhere on the Card be interpreted as a tap on the AnimatedTextKit ?
I have looked at these answers : How to pass Taps to widgets below the top widget? and How do I programmatically simulate onTap on a button in Flutter? but I feel like I'm not able to apply the proposed solutions since I cannot modify the AnimatedTextKit library code.