[Suggestion] Nether Infection

If anybody finds that the following below is already included in a mod, Please link me to it.

I always thought of a mod that allows Nether portals to infect the overworld, Like when the portal is left alone the blocks around it begin to turn into netherrack, soulsand etc.
There are 3 tiers of the infection when the portal is left alone:-

-> Blocks turn into nether blocks + Nearby trees burn
-> Netherwarts begin to grow on soulsand + patches of lava begin to appear
-> Nether mobs begin to spawn (Blazes, Wither Skeletons, PigZombies, Not by walking through portal)

The nether could also begin to have grass growing as if it is replaced and sent into the portal, like the affects in the overworld are reflected in the nether.

Other things could be added to this, Leave a reply with any you may have.