How to read result from the first step of parallel?

Question

QUESTION

In bash you can pass data from step to step by piping data:

program1 | program2 | program3 | ...

Or you can do this with variables (depending how each program work):

RES1=$(program1)
RES2=$(program2 $RES1)
...

I am looking for counterpart of such passing data in parallel.

EXAMPLE

I try to convert my "linear" script to the amazing parallel (this tool still do wonders for me :-D), but I have a problem with reading and using the output from the first step. Original version:

for fn in $(ls $REV *)
do
   DATA=$(sh script1.sh ${fn})
   sh script2.sh $DATA
done

Here how I tried to do this with parallel:

ls $REV * | parallel -j+0 DATA=$(sh script1.sh {}) \; sh script2.sh $DATA

However with this code myscript gets some broken data on input. Version with removed reading the result and second step altogether, works:

ls $REV * | parallel -j+0 sh script1.sh {}

So how to read the output from the first step of parallel and use it in next steps?

PROBLEM

For easier debugging let's say my first script (script1.sh) is:

echo "RECEIVED THIS ${1}"

And the main script is:

ls * | parallel -j+0 RES="$(sh script1.sh {})"

(I skipped the script2 here for testing capturing the output of script1). Then the result of entire execution is this:

/bin/bash: THIS: command not found
/bin/bash: THIS: command not found
/bin/bash: THIS: command not found
...