heredoc in awk? avoid nasty quoting to print o/p with special characters

Is there something akin to a "heredoc" in awk? I need to process a set of
records, extract relevant numbers from each record and then create a
formatted multi-line output for each record. Problem is that the output
would contain a lot of special characters and using a normal print or
printf would need me to do some nasty quoting (or not?)

The desired output snippet for each record is something like this:

{"id":"town",
"label":"middleton",
"x_size":"10.22",
"y_size":"5.22",
},


Of course, I'd be using $1 (or equivalent variables) for the town,
middleton, 10.22, 5.22 etc.

Any constructs like the familiar bash

print << EOF
static blah blah
"${var_to_be_inserted}"
more static blah blah
EOF

--
Rahul