Use several merge keys for Barcode/QRcode generation

[silopolis]

Hi,

First thanks for this great piece of code !
A feature I miss is the possibility to use/concatenate several merge keys/fields to build string for barcode/QRcode generation. Being able to use, say: "${tool_code};${vendor};${vendor_code}" would be awesome.
I temporarily solved it by doing the concatenation in the source spreadsheet, but may not be possible in every cases.

Thanks again and have a nice end of year