Python / Django: Criando uma lista mais simples a partir de values_list ()

Considerar

>>>jr.operators.values_list('id')
[(1,), (2,), (3,)]

Como simplificar ainda mais:

['1', '2', '3']

O objetivo

class ActivityForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(ActivityForm, self).__init__(*args, **kwargs)
        if self.initial['job_record']:
            jr = JobRecord.objects.get(pk=self.initial['job_record'])

            # Operators
            self.fields['operators'].queryset = jr.operators

            # select all operators by default
            self.initial['operators'] = jr.operators.values_list('id') # refined as above.

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