Create Model objects inside another models's Adminview

I'm trying to generalize access permissions to certain Nodes for each of my Groups. I have an Access Model model with three different fields: access_type, group and node. Each group can have either Source, Destination or Bidirectional Access to a node which has a name:

class Access(models.Model):
    
      
    class AccessType(models.TextChoices):
        BIDIRECTIONAL = "bi", "Bidirectional"
        SOURCE = "src", "Source"
        DESTINATION = "dst", "Destination" 

    
    access_type = models.CharField(max_length=3, choices=AccessType.choices)
    
    group  = models.ForeignKey(Group,on_delete=models.CASCADE, related_name='GroupAccess')
    node   = models.ForeignKey(DicomNode, on_delete=models.CASCADE)
    name = models.CharField(unique=True, max_length=128, null = True)

Similar to the common permission view inside the adminView I'd like to create Access objects inside the GroupView, so that they are created with the group which I am inside at the moment. Also, I'd like them do be displayed on the left side with all available Accesstypes and nodes, seperated with an '|' just like all the available permissions:

enter image description here

I have done the same already with a form to add existing users to a group:

class GroupForm(forms.ModelForm):
    users = forms.ModelMultipleChoiceField(
        label='Users',
        queryset=User.objects.all(),
        required=False,
        widget=admin.widgets.FilteredSelectMultiple(
            "users", is_stacked=False))

    class Meta:
        model = Group
        exclude = ()  # since Django 1.8 this is needed
        widgets = {
            'permissions': admin.widgets.FilteredSelectMultiple(
                "permissions", is_stacked=False),
        }


class MyGroupAdmin(GroupAdmin):
    form = GroupForm
    list_display = ["name", "pk"]
    def save_model(self, request, obj, form, change):
        # save first to obtain id
        super(GroupAdmin, self).save_model(request, obj, form, change)
        obj.user_set.clear()
        for user in form.cleaned_data['users']:
             obj.user_set.add(user)

    def get_form(self, request, obj=None, **kwargs):
        if obj:
            self.form.base_fields['users'].initial = [o.pk for o in obj.user_set.all()]
        else:
            self.form.base_fields['users'].initial = []
        return GroupForm

So my question is: how do I display every possible access configuration and then create this object with existing Nodes?

I'm very new to django and I honestly don't know where to start

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