How do layouts work?

[Overboard-code]

Two questions:

1. Does the layout128x64.json get chosen automatically if you use 128 and 64 for rows and columns on the initial command?
   for example:
   sudo python3 src/main.py --led-rows=64 --led-cols=128 --led-gpio-mapping=adafruit-hat-pwm --led-slowdown-gpio=2

2. what do the fields in the json file stand for?
   I see:

"team_summary": {
    "info": {
      "position": ["0%", 0]
    },
    "logo": {
      "position": ["40%", 0]
    }
  },
 },
 "home_logo": {
      "position": [["50%", 15], 0],
      "align": "left"
},
"away_logo": {
      "position": [["50%", -15], 0],
      "align": "right"
    },
    "vs": {
      "position": ["50%", "45%"],
      "align": "center-top",
      "font": "medium"
    },

What does ['50%','45% ']mean? Is that position on the screen or size of the logo?
center top and bottom seem to be OK

[Overboard-code]

Am I just missing a location for a schema? I don't see it.