Question email aliases for different domains in a subscription not possible?

[Azurel]

In plesk I can create a new mail account in a subscription with different domains, like:

info @ example.com or info @ example.net

I choose example.com and want set a alias to example.net, but that is not possible. I can only add aliases to example.com.

So the only way here is to create a real account for info @ example.net and forward it to info @ example.com?