Flutter Multiple Dragtargets with CustomPainter Path Possible?

Question

I want to know if this is even possible in Flutter Gridview and CustomPaint Items Desired Outcome

I tried it with a CustomPainter Class and different Custom Path Widgets In Flutter coded

import 'package:flutter/material.dart';

class PaintCharT extends CustomPainter {
  final double height;
  final double width;

  PaintCharT(this.height, this.width);

  @override
  void paint(Canvas canvas, Size size) {
    final Paint paint = Paint()
      ..color = Colors.blue
      ..style = PaintingStyle.fill;

    // Define the path for the letter "T"
    final Path path = Path()
      ..moveTo(0, 0)
      ..lineTo(width, 0)
      ..lineTo(width, width/3)
      ..lineTo((width/3)*2, width/3)
      ..lineTo((width/3)*2, width)
      ..lineTo((width/3), width)
      ..lineTo((width/3), width/3)
      ..lineTo(0, width/3)
      ..lineTo(0, 0);
    path.close();

    // Draw the letter "T"
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return false;
  }
}

And my DragTarget

DragTarget(
                                  onAccept: (data){
                                    setState(() {
                                      container81 = colorActive;
                                    });
                                  },
                                  onWillAccept: (data) {
                                    return data is DragPathState;
                                  },
                                  builder: (BuildContext context, List<Object?> candidateData, List<dynamic> rejectedData) {
                                    // Check if a draggable with 'T' data is being dragged over
                                    if (candidateData.isNotEmpty) {
                                      containerActive81 = true;
                                    } else {
                                      containerActive81 = false;
                                    }

                                    return Container(
                                      color: container81,
                                    );
                                  },
                                ),

But I couldn't understand the documentation to apply it to my case. I don't necessarily need this problem solved, I would rather know how I could achieve this myself with a little guidance (if even possible)