@TigerCole I think KNIME would not have a data type within KNIME. If you do not need the geo data *within’ KNIME would it be an option to just store the file (maybe save the path/name) and then reuse it later in a Python node.
Two additional remarks. You can use Jupyter notebooks with KNIME and also transfer data between them
(also check out the additional links at the sample workflow)
Then keep in mind, that the new Python nodes make use of the primary keys in a special way: