FutureBuilder before build method?

Is it possibile to call the future of a FutureBuilder and retrieve the snapshot before the actual build of the builder? In order to avoid the waiting of connectionState.waiting.
In code:

@override
  Widget build(BuildContext context) {
    return Scaffold(
      
      body: Column(
        children: [
          Expanded(
            child: SingleChildScrollView(
              child: Column(
                children: [
                  Padding(
                       child: ClipPath(
                        clipper: ShapeBorderClipper(
                          shape: RoundedRectangleBorder(
                            borderRadius: BorderRadius.circular(8),
                          ),
                        ),
                        child: Theme(
                          data: Theme.of(context).copyWith(
                              dividerColor: Colors.transparent),
                          child: ExpansionTile(
                            
                            title: const Text(
                              "In corso",
                              
                            children: [
                              FutureBuilder(
                                  future: _future,
                                  builder: (context,
                                      AsyncSnapshot<
                                          List<DocumentSnapshot>>
                                      snapshot) {
                                    if (snapshot.hasData) {
                                      List<String> schedineincorso = [];

                                      for (var DOC in snapshot.data!) {
                                        schedineincorso.add(DOC.id);
                                      }
                                      return Column(
                                        children: [
                                          // children...
                                        ],
                                      );
                                    } else {
                                      return const CircularProgressIndicator();
                                    }
                                  })
                            ],
                          ),
                        ),
                    ),
                  ),
                  
        ],
      ),
    );
  }

I'd like the data to be ready before the user expands the Expansion Tile, because at the moment when a user clicks on the Expansion Tile it shows the CircularProgressIndicator for a while.