Lua function to pretty print JSON, perhaps an optional arg for utils.format_json()?

[MoltenMonster]

Expected behavior of the wanted feature

I'm pretty printing JSON to a file using dkjson since MPV doesn't have a built-in function for it. Example:

{
  "video name":{
    "firstwatched":1767796909,
    "endtime":"5.528",
    "lastwatched":1767796909,
    "starttime":"0",
    "watchcount":1
  }
}

A function would be nice so I wouldn't need a module (just 1) in my script. Perhaps an optional 2nd arg could be added to utils.format_json(): a bool for if it should be pretty printed.