I'm searching for a possibility to send via pipe several multiline strings to a bash script and grab each of them within this script. Finally, I want to store each multiline string into its own variable.

printf "$some_multiline_string" "$another_multiline_string" | some_script.sh some_params

Inside of bash:

#!/bin/bash
file1=$(</dev/stdin)
file2=$(</dev/stdin)
...

How to split stdin into multiple multiline variables?