Hi @Anonymous ,
Do you want to display a number value as a barcode within your canvas screen?
Based on the needs that you mentioned, I afraid that there is no direct way to achieve your needs in PowerApps. As an alternative solution, I agree with @Anonymous 's thought almost.
Please consider add a Image control in your app, set the Image property to following:
"https://chart.googleapis.com/chart?cht=qr&chs=320x320&chl=" & 450
On your side, you should type:
"https://chart.googleapis.com/chart?cht=qr&chs=320x320&chl=" & DataTable1.Selected.NumberColumn

Best regards,