As per searching - Search results for 'nodejs port 8441 order:latest' - Blynk Community
Depends where it is installed on your RPi… search for this file blynk-node.js
on your RPi and change it as shown here… to 9443 or 443
BTW, since you do need basic config in each sketch anyhow, there is no reason not to define it there. At least it gives more control when switching between Cloud and Local Server, etc.