allow custom fields in resourcepack's pack.mcmeta

Please allow users to add custom fields in the pack.mcmeta of resource packs, such addition would allow resource pack makers to add a pack version, licensing, contact information and many other custom fields in the file and modders to parse the custom fields for modding purposes.

"but why not making the fiels built-in instead of custom ones?"
because some informations need to be more granular, like contact informations (there are tons of social networks and possible support channels, you can't add all of them) and some projects have more than one licensing model

"why would a mod want to parse custom fields?"
some mods may want to parse custom fields to add features to resource packs that don't fit in default minecraft or to provide to the user more informations of the resourcepack (example: "Mod Menu" mod for mods)