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Hi,

In odoo while printing PDF reports the docs are passing in the return of the function "def _get_report_values(self, docids, data=None)" as a key value pair in the dictionary. This value will be called in to XML template of the report. . If you want to pass extra data , you can pass it in the function as key ,value
example:    

def _get_report_values(self, docids, data=None):
        return {
            'doc_ids': docids,
            'doc_model': 'your.model',
            'docs': self.env['your.model'].browse(docids),
            'data': data,
            'company': self.env.company
        }

In the above the data are passed to the XML file as key value pairs.


For more please refer:

https://www.cybrosys.com/blog/how-to-create-pdf-report-in-odoo-16

Hope it helps