Can pdftk fill_form take both an input pdf and form data from stdin?

I'm spawning pdftk from my node application and want to use it to fill a PDF form. I want to be able to take my form data and pass it in via stdin and I also want to pass the input pdf via stdin as well. Is this possible?

const options = [
            '-',
            'fill_form',
            '-',
            'output',
            '-',
            'flatten',
        ];

        const child = spawn('pdftk', options);

The first - should tell pdftk that I want to pass the input pdf via stdin. The second - (after fill_form) should tell pdftk that I want to pass form data via stdin.

If I change the input PDF to be a filename this code works great.