I would like to get an example of reverse NAT for the below NAT command.

add action=dst-nat chain=dstnat dst-address=123.23.43.123 dst-port=80 protocol=tcp to-addresses=10.10.0.3

The end goal is the user should be able to access the webserver from within the network exactly how he would when he is outside the network.

There is no need.

IP > DNS > Static

create new static record:
name www.mywebpage
Address 10.10.0.3

There's also hairpin NAT. Compared to setting DNS record, it's more set it & forget it, which is what people usually like.

Thank you very much, the Hair pin NAT is exactly what I need !
I was indeed using static DNS to overcome this but wanted this to be automatic for any new web services we add for our internal servers. !