Probably not, unless your PD patch requires it. It’s available via apt:
sudo apt install pd-mrpeach
Then you’ll like have to place one of these objects in your patch:
[declare -lib mrpeach][declare -path mrpeach][declare -stdlib mrpeach][declare -stdpath mrpeach]
Just go through them and see which one works - you can test by placing some object belonging to mrpeach external. The ones placed already won’t resolve on their own, until you save and re-open your patch which contains the correct [declare ...] object.
For creating an ORAC user module, a ‘grammatically correct’ .json file is required. Make sure there’s no syntax errors, doublecheck by pasting it into https://jsonlint.com/.