Stdin and stdout simultaneously

Is it possible to use hashcat to use both stdin and stdout with hashcat simultaneously in order to generate candidates with --stdout?

I can only get this to work if I am using a file as the input to hashcat.  If I want to feed hashcat with stdin, it doesn't work.

This is an example that won't work.

./data_generator.sh | ./hashcat64.bin -r ./rules/dive.rule --stdout --outfile-autohex-disable

My goal is to use hashcat and its available rules in order to modify whatever I feed it via stdin.

Should this work or is it not a feature?