There are 2 placeholders you can use in the broadcast.yml
{PLAYERSENDER}
{PLAYERRECIEVER}

There is also a placeholder of:
{CORRECTSYNTAX}
For the invalid syntax message

This is so you can do a custom broadcast such as Welcome notch we have our discord at: <insert link> feel free to join!

We also have Hoverable and clickable text by doing the following
{HOVER:<Hover Text>|<Display Text>}
{CLICKLINK:<Link>|<Display Text>|<Hover Text>}
{CLICKFILE:<Path to file>|<Display Text>|<Hover Text>}
{CLICKCLIPBOARD:<Message to Copy>|<Display Text>|<Hover Text>}
{CLICKRUNCOMMAND:</command>|<Display Text>|<Hover Text>}
{CLICKSUGGESTEDCOMMAND:</command>|<Display Text>|<Hover Text>}

To do a new line in the hover text use <newline> to insert a new line in your text

You can use any minecraft sound from
https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Sound.html

Broadcast config commands

/Broadcast-config list
Lists all autobroadcast messages

/broadcast-config add message <Insert Autobroadcast message>
Adds a message to the autobroadcast list

/broadcast-config remove message <Insert ID>
Removes a message from the autobroadcast list

/broadcast-config edit message <content|permission|time> <Insert New Value>
Edits the message content permission or time to what specified
NOTE: time is done in hh:mm:ss

/broadcast-config edit prefix <Insert New Prefix>
Edits the prefix to the newly specified prefix

/broadcast-config edit delay <Insert New Delay In Seconds>
Edits the delay to the newly specified delay

/broadcast-config edit sound <Insert New Sound>
Edits the sound to the newly specified sound

/broadcast-config edit invalidsyntaxmsg <Insert New Invalid Syntax Message>
Edits the Invalid Syntax Message to the newly specified Invalid Syntax Message

/broadcast-config toggle autobroadcast <true/false>
Toggles Autobroadcast on or off

/broadcast-config toggle sound <true/false>
Toggles sound on or off

/broadcast-config toggle prefix <true/false>
Toggles the broadcast prefix on or off