Suggest you check out the PCF component created by Yash Agarwal @yashag2255. It has the ability to print a document based on a gallery.
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You can print data from gallery using the PCF mentioned in the above posts. Just in case you are looking to export as excel, you can follow this one as well: https://www.bythedevs.com/post/export-to-excel-from-canvas-apps-in-power-apps-using-pcf
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Features releasing from October 2019 through March 2020