I'm trying to display a SliverAppBar as shown on my design

but I'm not sure it can be done in Flutter

here is my code so far

        SliverAppBar(
      // title: ,
      backgroundColor: Colors.grey[200],
      expandedHeight: 300,
      centerTitle: true,
      shape: const ContinuousRectangleBorder(
          borderRadius: BorderRadius.only(
              bottomLeft: Radius.circular(100),
              bottomRight: Radius.circular(100))),
      actions: <Widget>[
CircleAvatar(
              radius: 20,
              // foregroundColor: Colors.red,
              backgroundImage: AssetImage(
                'assets/img/categories/player.png',
              ),
            ),
      ],
      flexibleSpace: FlexibleSpaceBar(
        background: Container(),
        centerTitle: true,

        title: Container(
          height: 40,
          child: Column(
            children: [
              Text("Mrs Surname Name",
                  style: TextStyle(
                    fontFamily: 'Kannada Sangam MN',
                    fontWeight: FontWeight.w500,
                    fontSize: 20,
                    // color: AppTheme.high_emphasis,
                  )),

            ],
          ),
        ),

      ),
      pinned: true,
      floating: false,
      elevation: 0,
    ),

I'd like for the name & Motif to show even when scrolled up also the Avatar but smaller

But the "Constantes" to hide when scrolled up