[Geysermc] Java 16 for spigot bukkit versions to 1.13.x - 1.16.x

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    Hello, I want to create a crossplay server using Geysermc in spigot bukkit version 1.16.3
    
    Geysermc needs java 16 to work, but the version of spigot bukkit that I want doesn't support that version of java and crash it.
    
    Geysermc's website says that I need to add the following flag ( -DPaper.ignoreJavaVersion = true ) to my startup Java arguments to allow Paper to run on Java 16 but I don't know how to add that flag to my server, help me please.
    
    Postscript: The spigot bukkit server in version 1.12.2 works correctly with java 16