The mod API does not support custom instructions or rewriting vehicle code, so workshop mods would not be able to do anything that complex. There are similar feature request cards on the Trello if you want to upvote or add comments:

https://trello.com/c/x3eTk7WU

https://trello.com/c/ZJRtli3m
https://trello.com/c/FuC5WDdJ

Oh, ok. thank you for responding.

for bot in and out of the area you can already do with some simple coding i already use this to send a team of bots in my loading bay when a cart is coming in i have one bot with a simple code with a box and a Coconut

Until hands empty
- Find nearest bot in
- add to storage 1
Until hand not empty
-Find nearest bot in
-take from storage 1

the zones are just in lines on my road so when a bot passes it it will either take from or put in storage if entering or leave area

my loading bots do other thing until the storage is not empty

now you can use an if/else statment to tell them to do things once storage 1 empty or not empty, i i use repeats myself

Repeat until Storage 1 empty
(insert what you want them to do when bot has crossed the line, in my case they all move to the loading bay fill hands and load carts until they leave)

Repeat until storage 1 not empty
(they do whatever i had them doing before the carts came over)