can angular-filter groupby object

```
$scope.players = [
{name: 'Gene', team: 'alpha'},
{name: 'George', team: 'beta'},
{name: 'Steve', team: 'gamma'},
{name: 'Paula', team: 'beta'},
{name: 'Scruath', team: 'gamma'}
];
groupBy: 'team'
```
I know this ok.

can angular-filter groupby do this?

```
$scope.players = [
{1,{name: 'Gene', team: 'alpha'}},
{2,{name: 'George', team: 'beta'}},
{3,{name: 'Steve', team: 'gamma'}}
];
groupBy: 'team'
```
yeah it's not {key,value}