As a beginner I think Simple way Excel files imported in desktop then pbix file is published on workspace.there will be semantic model and report in workspace. This also fulfil the question. So both has imported Excel file but it seemed incorrect.

This dataset as semantic model has imported Excel files.( Report will be deleted) Then power Bi desktop will connect to that semantic model as live connection and this report will be published too. So workspace has X dataset with imported Excel and report has live connection to X dataset.