@TheBlock1717 ;

Square Label creation has been an issue for adding text or label sizes for years. So the easiest way is being creative like @DLRosenberg has described. The other way would be to use your barcode label printer out of Square.  Use another computer to design and print your barcodes with your Label Printers software or a label template for a word processing program.  I have label printers and currently use my Label printers software to make my own labels. 

Benefits of this:

1.  More control of what is printed.  Think Fonts or text.
2. I can put Sales Prices on older stock or NEW ITEM for example.
3. More Label sizes. Square does not support Bar Bell or Jewelry size labels, which I print barcodes on.
4. Custom Labels.  My Custom labels have My website, address, phone Number and company name in colors already pre-printed with an area to print my Barcode and Scent of my candle.
5. Custom Barcodes. Multiple Barcodes even.  I use 2D square barcodes so all my Barcodes are the same size roughly to ring up items. Also if I wanted to I could put a QR code on the label to take the customer to the website to order more.  Another benefit of 2D barcodes is my SKU is upto 30 characters long, and can fit in a 3/8 inch square.  1D barcodes get longer the more character you add.

Depending on which Label printer you have or their software, you could export your Square catalog to csv file, then have the Label printers software pull the data from there.  I know Dymos software can do that for free.  The label printers I use can do this if I buy their Premium software for $300.  Right now I hand type my Labels as I want Copy (Ctrl +C) the barcode and the Ctrl +V Paste it into the Free Label software then save the barcode in an organized Folder system to be able to quickly open the previously created label to print in the future.  I even Created some for Templates to just adjust name of Item and the Barcode text, this saves time when I get new items that I need to print Barcodes for.