Your desired servers will always be listed.
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From a page that is GPLv3 licensed that sounds very familiar to this.

This is a mod that removes the need to ship a servers.dat file that overwrites player-added servers.
Stop shipping that file and add Desired Servers! You can add multiple servers with a simple json format.
On first run, the mod will generate a desiredservers.json with the following content if one isn't present:
[
{
"serverName": "Desired Server",
"serverIP": "127.0.0.1"
},
{
"serverName": "Another Desired Server!",
"serverIP": "192.168.1.1"
}
]
Adding a server is as simple as adding another json block with the details.
The server is added to the server list on load, if it is already there it will be ignored.
Server list JSON
Servers in the multiplayer screen
ported to 1.16.1
source now available
client only
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