i'm not sure but if you create a json file and fill with the server'id and a channel'id in that server that you want to send a message to.
example:
[
{"guildId":"firstserver'id",
"channelId":"aChannelInThatServer"
}
{"guildId":"secondserver'id",
"channelId":"aChannelInThatServer"
}
......
]
and then create a command that loops through this file and checks if the client is in those server and if it's in a server, it should check if that channel exists in that guild , and if it does, it finally send the message there.
in theory this should work but i still don't know if that is possible
again check the discord.js documents to learn more about clients and guilds
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