I like the work you have done on this mod and I would like to iterate over it. Would you be willing to add an MIT license to it so I, or anyone else, can legally do that? I will release my own mod as MIT.

If you are willing to do so simply edit the description quickly, stating you grant permission to use your mod in the context of the MIT license. You can also reupload it with the license text file but that's not mandatory.

https://en.wikipedia.org/wiki/MIT_License