Custom label in New Label Engine

[follet-git]

Hello, I use Snipe-IT Version v6.2.3.
I like the new feature but I see only 9 label sizes.
I use a Godex G500 Label printer with labels size: 40 x 20 mm.

• I would like to create custom preset Improve UI of category display to show nesting #10 with my label size
• Also, I need to know the "DataSource" values to insert data to label
  Can you help me with it?