I have not written any specific instructions at this point. But here's a basic guide that might work for you.
Used the Windows install as a base
https://docs.requarks.io/install/windows
Made sure to have Node 12 loaded and SQLite 3 from IBM Open Source packages.
Download the Node app file. I used the Windows package and it worked fine since it's Node https://github.com/Requarks/wiki/releases/download/2.3.81/wiki-js-windows.tar.gz
Upload tar file to root of IFS
/wiki-js-windows.tar.gz
Run this from bash shell or qp2term or possibly strqsh
mkdir /wikijs
mkdir /wikijs/database
mkdir /wikijs/backups
cd /
tar xzf wiki-js-windows.tar.gz -C /wikijs cd /wikijs
Ran this to rebuild SQLite3 driver binary I am using on IBM i (Only worked for node 12)
npm rebuild sqlite3
Copy sample config file to actual config file
cp /wikijs/config.sampl.yml /wikijs/config.yml
Edit config.yml file via your favorite PC file editor or WRKLNK I suppose.
Db
type: sqlite
storage: /wikijs/database/database.sqlite
Run WikiJs
node server
Hit site via browser and config
http://systemip:3000
Use the rest of the basic WikiJS site instructions
https://docs.requarks.io/guide/intro