Config defaults

Hello, I want to create 2 config paths on default whenever the config is first created/empty.
I want a “spawn-loc” and “player-stats” section in the same file, however I’m unsure how to go about this.

Do I create the defaults in my onEnable? Would it override all the info stored in these sections by doing so? How can I create these sections only if they don’t exist, if not, then keep all current data in my sections, Thankyou!

Code:

 public void onEnable() {
 util.registerCommands();
 util.registerListeners();
 
 if (this.getConfig().getConfigurationSection("player-data") == null) {
 if (this.getConfig().getConfigurationSection("spawn-loc") == null) {
 
 this.getConfig().createSection("player-data");
 this.getConfig().createSection("spawn-loc");
 
 }
 }
 
 this.getConfig().options().copyDefaults(true);
 this.saveConfig();
 
 }

this creates my defauts, im unsure why they have a '{}' next to them either.. When the player joins it wont put them into the created section?

Code:

 if (!(pl.getConfig().getConfigurationSection("player-data").contains(p.getName().toLowerCase()))) {
 
 pl.getConfig().set(pl.getConfig().getConfigurationSection("player-data") + p.getName().toLowerCase() + ".uuid", uuid);
 pl.getConfig().set(pl.getConfig().getConfigurationSection("player-data") + p.getName().toLowerCase() + ".kills", 0);
 pl.getConfig().set(pl.getConfig().getConfigurationSection("player-data") + p.getName().toLowerCase() + ".deaths", 0);
 pl.getConfig().set(pl.getConfig().getConfigurationSection("player-data") + p.getName().toLowerCase() + ".balance", 100);
 pl.saveConfig();
 } else {
 
 p.sendMessage("welcome back!");
 
 }

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{} means section has no data.
Just use getConfig()#set(key, value);

Code:

    getConfig().set("player-data", pdata);
    getConfig().set("spawn-loc", sloc);