JEI currently has the feature to populate a machine/table's inventory or grid to do a certian recipe by clicking the + button when viewing the recipe for the item. However, this requires viewing the recipe for the item, which can get clunky when you are trying to do complex nested crafting [E.G. GregTech]. What i am suggesting is a mouse/keyboard hotbind to automatically populate an inventory or grid with the first valid and available recipe of whatever item you had highlighted.

for example: presing said hotkey (i will refer to it as 'y' for simplicity) on an iron ingot in your crafting table will search through all crafting recipes for iron ingots. if you were to, say, have 9 iron nuggets, and pressed Y, it would put them in the grid. if you were to have an iron block, it would do the same. if you were in a furnace and pressed Y while hovering over an iron ingot, it would put iron ore into the furnace instead. holding shift while pressing Y, will, similar to the + button, populate the machine or table with as much of the recipe as possible, up to a stack of each ingredient. In short, it would function identically to the + button, but with 2 major benfiits. for one thing, it will use whatever recipe results in the item, so you don't have to sort through 20 different wood type recipes for chest (like you have in certian 1.16 modpacks). Secondly, you don't have to pass through the recipe browser GUI first, which can also get annoying when you need to craft something very frequently.