It's on the todo list, basically import command. It takes a bit of work, but hopefully will do soon.
0.7 compression update
Improvements to nbt data generation, nbt json encoding follows minecraft format which is more compressed. Also trimed redundant elements from name and lore text. Fixed some issues with lore lines and carriage return.
Added minecraft formated json encoding method, option for minecraft/standard (extras)
Added name item short/long option for servers (extras)
Improved Lore nbt generation and removed superfluous elements
Old versions of Give Command Generator not working
First I absolutely love your Give Command Generator and I know you are working on 1.16, but I thought you would like to know that your "Permalinks to versions 1.12 through 1.15 do not work, they go to a grey box which says "Loading..." but never loads. Some of us will be staying with older versions, again thanks for an awesome site.