True, PATH can't be set here because it is overwritten later.
But bin folder from addon is automatically add to it. So move everything under /storage/.kodi/addons/node.js folder.
My all commands to make it happen:
mkdir -p /storage/.kodi/addons/node.js/profile.d
cd /storage/.kodi/addons/node.js
echo "export NODEJS_HOME=/storage/.kodi/addons/node.js" >profile.d/node.js.profile
wget https://nodejs.org/dist/v10.15.3/node-v10.15.3-linux-armv6l.tar.xz
tar --strip-components=1 -xf node-v10.15.3-linux-armv6l.tar.xz
rm node-v10.15.3-linux-armv6l.tar.xz
# exit terminal and login again
LibreELEC:~ # node -v
v10.15.3
LibreELEC:~ # ls -al $NODEJS_HOME
total 153
drwxr-xr-x 7 root root 1024 Apr 17 08:35 .
drwxr-xr-x 45 root root 3072 Apr 17 08:35 ..
drwxrwxr-x 2 500 500 1024 Apr 17 08:35 bin
-rw-rw-r-- 1 500 500 53097 Mar 5 16:53 CHANGELOG.md
drwxrwxr-x 3 500 500 1024 Apr 17 08:35 include
drwxrwxr-x 3 500 500 1024 Apr 17 08:35 lib
-rw-rw-r-- 1 500 500 65839 Mar 5 16:53 LICENSE
drwxr-xr-x 2 root root 1024 Apr 17 08:35 profile.d
-rw-rw-r-- 1 500 500 26697 Mar 5 16:53 README.md
drwxrwxr-x 5 500 500 1024 Apr 17 08:35 share
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