Django form set css class on selection values

Question

in my django app, i have simple form like this:

class ThrowForm(forms.ModelForm):
def __init__(self,game,*args,**kwargs):
    super (ThrowForm,self ).__init__(*args,**kwargs)
    self.fields['player_id'].queryset = Player.objects.filter(Q(team_id = game.team1_id) | Q(team_id = game.team2_id))

class Meta:
    model = Throw
    fields = ['player_id', 'score','game_id']

How can i set an css class on the different values in the player_id field. I imagine that the players of team 1 have a different font color than those of team 2. Is this possible?

Thanks