sizes.json

{
    "sizes": {
        "1:1 [1024x1024 square]": {"width": 1024, "height":  1024},
        "8:5 [1216x768 landscape]": {"width": 1216, "height":  768},
        "4:3 [1152x896 landscape]": {"width": 1152, "height":  896},
        "3:2 [1216x832 landscape]": {"width": 1216, "height":  832},
        "7:5 [1176x840 landscape]": {"width": 1176, "height":  840},
        "16:9 [1344x768 landscape]": {"width": 1344, "height":  768},
        "21:9 [1536x640 landscape]": {"width": 1536, "height":  640},
        "19:9 [1472x704 landscape]": {"width": 1472, "height":  704},
        "3:4 [896x1152 portrait]": {"width": 896, "height":  1152},
        "2:3 [832x1216 portrait]": {"width": 832, "height":  1216},
        "5:7 [840x1176 portrait]": {"width": 840, "height":  1176},
        "9:16 [768x1344 portrait]": {"width": 768, "height":  1344},
        "9:21 [640x1536 portrait]": {"width": 640, "height":  1536},
        "5:8 [768x1216 portrait]": {"width": 768, "height":  1216},
        "9:19 [704x1472 portrait]": {"width": 704, "height":  1472}
    }
}