This is a open source project that was designed off of SimpleAnnounce by STG_Allen. I do not take any credit for the code. This project takes his plugin and adds a server grabber and username grabber and puts it into /shout and /staffchat.
Designed for Velocity 3.0.0
Color codes work as well!
/staffchat (message) requires perm staffchat.use (Requires permission to see messages)
/shout (message) requires perm shout.use (Sends messages to all players on all servers)
Console (The colors are the same as the above image, this bottom image is from my personal copy):
[ie] = server player is on or for me its infinity evolved