Seamless Teleportation Command

There should be a command that allows seamless teleportation, so when you teleport to the destination you want, there is no flash on the screen because it’s loading in the chunks. No no no it would be seamless! You wouldn’t even know you’ve teleported until you’ve gotten to the other side. It would be something like this: 

/tp @a[r=6] 156 78 -208_146 66 456

And whatever direction you face while you walk to the other side, that’s where you’ll be facing while you get there.

The way I think it will probably work is when you type in your “home” coordinations 156 78 -208 it will save the chunks of that “home” area in a.. for example 300 block radius. 

Then, when you type in your destination coordinations: 146 66 456 it saves the chunks of that destination area in a 300 block radius! So.. when you get teleported there, the chunks have already been loaded and it’s seamless! On both sides!  No flash, no glitch, no waiting,

Now, this is just how I think it will work, cuz I don’t no anything about coding or game stuff so I really don’t know. There probably is a much easier way of making it but yeah. 

Please take this into consideration, I think many people will be grateful of this because it’s so easy. No placing to command blocks in each destination, there is just one command block that opens two doorways and in that second destination, you can get teleported back within a 5 block radius that you don’t spawn in, so you don’t get stuck in a loop. Please consider.