Edited my answer to print a number on top of the QR code. This will probably make your QR code unreadable in most instances. Printing one object over another object is just a matter of positioning.
I'm going to assume that the Toshiba is using ZPL emulation. Here is some sample ZPL code that produces a QR Code and human readable over the top of the QR Code. Replace QR_CODE_DATA with the data you want in the QR Code. Replace NUMBER_OVER_CODE with the number you want as human readable. You will need to adjust the ^FO Field Origin coordinates to match where you want to place the objects on the label. You will also need to change the properties of the code and human readable for size and dimension. Positioning is done in dots, so you base the position on the number of dots per inch on your printer.
^XA
^FO557,556
^BQN,2,4^FDLA,QR_CODE_DATA^FS
^FT576,632
^CI0
^A0N,68,94^FDNUMBER_OVER_CODE^FS
^PQ1,0,1,Y
^XZ