You are right! This is my test Node-RED (running on a Raspi 4) just installed today for voice2json, so I decided to install this node, too.
After installing git (nothing else despite the dependencies) it throws these errors:
gyp ERR! build error
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack at ChildProcess.onExit (/usr/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:194:23)
gyp ERR! stack at ChildProcess.emit (events.js:315:20)
gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12)
gyp ERR! System Linux 4.19.118-v7l+
gyp ERR! command "/usr/bin/node" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /home/pi/.node-red/node_modules/utf-8-validate
gyp ERR! node -v v12.18.2
gyp ERR! node-gyp -v v5.1.0
gyp ERR! not ok
and some warnings, but the node works now. Thank you!