Leave default values again, through the console, in a firewall rule

Hello good day.
I need to leave the default value, in a few lines of the nat, because I want to change a common value, specifically the input interface, for a list of interfaces and I want to do it in a simple way, with a single line through the console, it is say, by commands, but I don’t know what command I have to enter, to leave the interface section, in default values, that is, empty, to change them all at once.
An example:

If I wanted to change all the nat rules, which would enter through the ether1 interface, to replace them with ether2, the rule would be simple, it would be this:

/ip firewall nat set [find in-interface=“ether1”] in-interface=“ether2”

But if what I want, is that in the section where the ether1 is, not be replaced by anything, but leave it empty, that is, to return to its default state, what would the command be?
Can somebody help me?

Thanks in advance.

Hey. Try

find in-interface!=""

No, this does not work, but Garcia, I have already discovered, how it is done.

It is with the unset command
Thanks