A bit of pain assigning variables in GEN3

Summary:

Please, I would need help with the following.

I noticed when started with GEN3 that when assigning manually content to variables was not quick.

Example:

I need to cut and paste from a this working integration the content of a variable:

fn:floor ( ( fn:current-dateTime() - ns0:dateTime("1970-01-01T00:00:00") )div ns0:dayTimeDuration("PT1S") )

With any other similar approach happens the same.

When I paste in another integration, I get error:

How to I fix the error?

I have to assign manually every component, which is a pain. (eg. I have to do this assignment in 50 integrations in several places, this is very time consuming).