Dynamically change QComboBox delegate values ?

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Well, the thing I don't know is : how do I connect a signal to all my ComboBox delegates ?

Imagine I have a ComboBoxDelegate class with a update_itemslist slot :

class ComboBoxDelegate(QItemDelegate):
    def __init__(self, owner, itemslist):
        QItemDelegate.__init__(self, owner)
        self.itemslist = itemslist
 
    @pyqtSlot(list)
    def update_itemslist(self, itemslist):
        editor.addItems(itemslist)

class ComboBoxDelegate(QItemDelegate):
    def __init__(self, owner, itemslist):
        QItemDelegate.__init__(self, owner)
        self.itemslist = itemslist

    @pyqtSlot(list)
    def update_itemslist(self, itemslist):
        editor.addItems(itemslist)

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I would like to emit a signal from my middleware_ui_arbiter class defined below :

class middleware_ui_arbiter(QWidget):
 
    # PyQT signals need to be declared outside __init__
    signal = pyqtSignal(str)
 
    def __init__(self, parent=None):
        super(middleware_ui_arbiter, self).__init__(parent)
 
        # Widget definition
        self.view       = QTreeView()
 
        # Model definition 
        self.model = QStandardItemModel(0,ARBITER_NB_COLUMNS)
 
        # Set delegates
        self.view.setItemDelegateForColumn(1, ComboBoxDelegate(self, ["In", "Out"]))
        self.view.setItemDelegateForColumn(2, ComboBoxDelegate(self, []))

class middleware_ui_arbiter(QWidget):

    # PyQT signals need to be declared outside __init__
    signal = pyqtSignal(str)

    def __init__(self, parent=None):
        super(middleware_ui_arbiter, self).__init__(parent)

        # Widget definition
        self.view       = QTreeView()

        # Model definition 
        self.model = QStandardItemModel(0,ARBITER_NB_COLUMNS)
        
        # Set delegates
        self.view.setItemDelegateForColumn(1, ComboBoxDelegate(self, ["In", "Out"]))
        self.view.setItemDelegateForColumn(2, ComboBoxDelegate(self, []))

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Is there a way to connect a signal to, let's say, all the ComboBoxDelegate of column 2 ?

I imagine a call like this :

self.<something>.connect(self.<something>.update_itemslist)

self.<something>.connect(self.<something>.update_itemslist)

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The thing is I don't know what <something> is in the code beneath.