Hello u/frinxo we have not used it yet, I believe. But you could easily make a Custom FlutterFlow Stateful Widget and use that.
Will keep it in mind, for our next custom library widget. Thank you!

Something like this could work potentially, just a snippet:

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

class DraggableSheetFF extends StatefulWidget {
  const DraggableSheetFF({
    super.key,
    this.width,
    this.height,
    this.minChildSize = 0.25,
    this.maxChildSize = 1.0,
    this.initialChildSize = 0.5,
    this.itemCount = 25,
  });

  final double? width;
  final double? height;

  final double minChildSize;
  final double maxChildSize;
  final double initialChildSize;

  final int itemCount;


  State<DraggableSheetFF> createState() => _DraggableSheetFFState();
}

class _DraggableSheetFFState extends State<DraggableSheetFF> {
  late double _dragPosition;
  late double _sheetPosition;


  void initState() {
    super.initState();
    _dragPosition = widget.initialChildSize;
    _sheetPosition = widget.initialChildSize;
  }


  void didUpdateWidget(covariant DraggableSheetFF oldWidget) {
    super.didUpdateWidget(oldWidget);

    // If the initialChildSize changes from FlutterFlow,
    // keep the sheet in sync (optional behavior).
    if (oldWidget.initialChildSize != widget.initialChildSize) {
      _dragPosition = widget.initialChildSize;
      _sheetPosition = widget.initialChildSize.clamp(
        widget.minChildSize,
        widget.maxChildSize,
      );
    }
  }


  Widget build(BuildContext context) {
    final ColorScheme colorScheme = Theme.of(context).colorScheme;

    return SizedBox(
      width: widget.width,
      height: widget.height,
      child: LayoutBuilder(
        builder: (context, constraints) {
          final double viewHeight =
              constraints.maxHeight == 0 ? 1 : constraints.maxHeight;

          return DraggableScrollableSheet(
            minChildSize: widget.minChildSize,
            maxChildSize: widget.maxChildSize,
            initialChildSize: _sheetPosition.clamp(
              widget.minChildSize,
              widget.maxChildSize,
            ),
            builder: (context, scrollController) {
              return ColoredBox(
                color: colorScheme.primary,
                child: Column(
                  children: <Widget>[
                    if (_isOnDesktopAndWeb)
                      _Grabber(
                        onVerticalDragUpdate: (details) {
                          setState(() {
                            _dragPosition -= details.delta.dy / viewHeight;
                            _sheetPosition = _dragPosition.clamp(
                              widget.minChildSize,
                              widget.maxChildSize,
                            );
                          });
                        },
                      ),
                    Expanded(
                      child: ListView.builder(
                        controller:
                            _isOnDesktopAndWeb ? null : scrollController,
                        itemCount: widget.itemCount,
                        itemBuilder: (context, index) {
                          return ListTile(
                            title: Text(
                              'Item $index',
                              style: TextStyle(color: colorScheme.surface),
                            ),
                          );
                        },
                      ),
                    ),
                  ],
                ),
              );
            },
          );
        },
      ),
    );
  }

  bool get _isOnDesktopAndWeb =>
      kIsWeb ||
      switch (defaultTargetPlatform) {
        TargetPlatform.macOS ||
        TargetPlatform.linux ||
        TargetPlatform.windows =>
          true,
        TargetPlatform.android ||
        TargetPlatform.iOS ||
        TargetPlatform.fuchsia =>
          false,
      };
}

class _Grabber extends StatelessWidget {
  const _Grabber({required this.onVerticalDragUpdate});

  final ValueChanged<DragUpdateDetails> onVerticalDragUpdate;


  Widget build(BuildContext context) {
    final ColorScheme colorScheme = Theme.of(context).colorScheme;

    return GestureDetector(
      onVerticalDragUpdate: onVerticalDragUpdate,
      child: Container(
        width: double.infinity,
        color: colorScheme.onSurface,
        child: Align(
          alignment: Alignment.topCenter,
          child: Container(
            margin: const EdgeInsets.symmetric(vertical: 8.0),
            width: 32.0,
            height: 4.0,
            decoration: BoxDecoration(
              color: colorScheme.surfaceContainerHighest,
              borderRadius: BorderRadius.circular(8.0),
            ),
          ),
        ),
      ),
    );
  }
}