Correct List Return

Good morning, I’m starting on the flutter and I need to resolve a doubt that is leaving me with my hair standing on end.

I have this:
Future <List <Map <String, dynamic >>> retData (String sql) async {
Database db = await this.database;
var result = await db.rawQuery (sql);
return result;
}

I called it:
List data = await databaseHelper.retDados (‘select configAcesPlanilha2 from data’);
print (data);

It is returning like this in print ():
I / flutter (23862): [{configAcesPlanilha2: 4}]

I need to return only the query value not the column name next

In case it should return like this:
I / flutter (23862): 4

How do I do it?
Can someone help me for god’s sake …