Maybe there's just a command I need to enter, but if there is, I'd love to know what the command is.

If there's no command, I'd like to see a datapack that makes it so that applying bonemeal to a crop will always cause the crop to go straight to the max growth stage, and will always cause saplings to sprout trees 100% of the time, even if the oak saplings are surrounded by stone slabs to ensure only the large trees grow. Of course, if I want to only grow my crops to a certain level for aesthetic reasons, I can temporarily turn off the function by crouching, at which point, bonemeal will always increase the crops by exactly one growth stage, no more no less.

Is there either a command or a data pack that can give me some or all of these features?