Specifying licenses that are not included with guix

[nils]

Hello,

I'm currently packaging vim plugins. This is mostly going well, but I've hit 
some license-related issues.

1. What do I do if a package specifies a license that is not included in 
guix/licenses.scm ? For example, vim-sandwich uses the NYSL license [1] 
(between public-domain and WTFPL), coc.nvim is the originator of the "Anti 996" 
License [2] (modified version of MIT / expat).

2. What do I do if a package specifies no license at all? For example see 
https://github.com/coderifous/textobj-word-column.vim/issues/11


[1] 
https://github.com/machakann/vim-sandwich/blob/c5a2cc438ce6ea2005c556dc833732aa53cae21a/doc/sandwich.txt#L6-L8
[2] 
https://github.com/neoclide/coc.nvim/blob/3014125e4ab7d35e08bbcde946dca4812b84f105/LICENSE.md