I have the problem many beginners have.

I have a server that I can access from lan with local IP but not the domain name.
Outside it works perfect to connect with domain name.

I have seen script that add local IP to external IP and vice but is there a way to do tis with the web GUI?

Or is there an option that redirect all my domain name to external IP?
It should be nice to have that feature, I know pfsense have it.

Much easier when you have a server that have many port and different protocols.

Consider doing Hairpin NAT
https://wiki.mikrotik.com/wiki/Hairpin_NAT

Very easy way;
https://www.youtube.com/watch?v=_kw_bQyX-3U

Alternatively you can set a static DNS entry but that's not as much fun as doing a "real" hairpin NAT with the correct port forwards.