Nifi - Update attribute Append multi values

[#1]

I am using nifi update attribute processor and I need to append multiple values. right now I only see method to append one value at a time.

Here is what I need to do:

value1: "hello"

Value2:" "

Value3: "World"

I am using :append expression language.

[#2 · Accepted solution]

@sunile manjee

Just chain multiple append operations in the same UpdateAttribute processor like: