[QGIS-Developer] What is the way to get all items of a QgsLayout?

[Song Wendong]

We want to make a function that send all items (mainly labels) to browser and let user set the cotent, then send it back to server and export as pdf.
I can only find itemById<https://qgis.org/pyqgis/master/core/Layout/QgsLayout.html#qgis.core.QgsLayout.itemById>and itemByUuid<https://qgis.org/pyqgis/master/core/Layout/QgsLayout.html#qgis.core.QgsLayout.itemByUuid>, but there are all kinds of layouts.
Is there a way to get all items and their ids?

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