pyqgis 3 - Loading print layout using an existing template (.qpt) with PyQgis3

I'm trying to load a print layout (.qpt) which I saved earlier via PyQgis.

I found this earlier entry, but it's for QGIS 2.x and thus doesn't work for QGIS3: Programmatically load composer from template and generate atlas using pyQgis

Does anyone know how to do this in QGIS3?