The newline (\n) is not working in END block in bash [duplicate]

I need to define the "\n" in END block as it will be passed to other bash script as an argument.

I have added an empty newline at the begin and at the end. But only the begin empty line (\n) is working and the end empty line (\n) is not working.

Here is the test script:

string="$(cat <<"END"foothe "newline(\n)" in "END" before the foo is workingbut "newline(\n)" in "END" after the bar is not workingbarEND)"echo ""echo "--- method 1 - define \n in END block ---"echo ""printf "%s" "first line in single line (method 1)"printf "%s" "$string"printf "%s" "last line in single line (method 1)"echo ""echo ""echo "--- method 2 - define \n in printf ---"echo ""printf "%s" "first line in single line (method 2)"printf "%s\n" "$string"printf "%s" "last line in single line (method 2)"

Here is the output:

--- method 1 - define \n in END block ---first line in single line (method 1)foothe "newline(\n)" in "END" before the foo is workingbut "newline(\n)" in "END" after the bar is not workingbarlast line in single line (method 1)--- method 2 - define \n in printf ---first line in single line (method 2)foothe "newline(\n)" in "END" before the foo is workingbut "newline(\n)" in "END" after the bar is not workingbarlast line in single line (method 2)

Here is the expected output:

--- method 1 - define \n in END block ---first line in single line (method 1)foothe "newline(\n)" in "END" before the foo is workingbut "newline(\n)" in "END" after the bar is not workingbarlast line in single line (method 1)

How to set the "\n" in the END block for making it work with method 1?

Update:

I tried to use variable inside the method provided by @tripleee:

var1="hello world"string='foothe "newline(\n)" in "END" before the foo is workingbut "newline(\n)" in "END" after the bar is not working$var1bar'printf "%s" "$string"

Here is the output:

foothe "newline(\n)" in "END" before the foo is workingbut "newline(\n)" in "END" after the bar is not working$var1bar

The $var1 is not replaced by the real content.

If I switch to the double quotes ("), then it must be use many escape characters (\") inside the "long long long and complex..." content.

How to make $var1 working with this method (without END block)?