Custom fonts using merge fields video template

{
    "merge": [
        {
            "find": "FONT",
            "replace": "https://shotstack-assets.s3-ap-southeast-2.amazonaws.com/fonts/IndieFlower-Regular.ttf"
        },
        {
            "find": "FONT_NAME",
            "replace": "Indie Flower"
        }
    ],
    "timeline": {
        "soundtrack": {
            "src": "https://s3-ap-southeast-2.amazonaws.com/shotstack-assets/private/epic.mp3"
        },
        "fonts": [
            {
                "src": "{{FONT}}"
            },
            {
                "src": "https://shotstack-assets.s3-ap-southeast-2.amazonaws.com/fonts/LilitaOne-Regular.ttf"
            }
        ],
        "background": "#000000",
        "tracks": [
            {
                "clips": [
                    {
                        "asset": {
                            "type": "html",
                            "html": "<p>Shotstack enables businesses to massively <b>scale</b> their video production capabilities using <b>code</b>.</p>",
                            "css": "p { font-family: \"Lilita One\"; color: #ffffff; font-size: 34px; text-align: left; } b { color: #25d3d0 }",
                            "width": 600,
                            "height": 400,
                            "background": "transparent"
                        },
                        "start": 1.2,
                        "length": 5,
                        "transition": {
                            "in": "fade",
                            "out": "fade"
                        },
                        "position": "left",
                        "offset": {
                            "x": 0.2
                        }
                    },
                    {
                        "asset": {
                            "type": "html",
                            "html": "<p>This new HTML asset type supports <b>highlighted text</b> and <b>wrapping</b> to create flexible and stylish layouts.</p>",
                            "css": "p { font-family: \"{{FONT_NAME}}\"; color: #ffffff; font-size: 34px; text-align: left; } b { color: #25d3d0 }",
                            "width": 600,
                            "height": 400
                        },
                        "start": 6.2,
                        "length": 5,
                        "transition": {
                            "in": "fade",
                            "out": "fade"
                        },
                        "position": "left",
                        "offset": {
                            "x": 0.04
                        }
                    }
                ]
            },
            {
                "clips": [
                    {
                        "asset": {
                            "type": "video",
                            "src": "https://shotstack-pubic-files.s3-ap-southeast-2.amazonaws.com/tutorials/hello-world/earth.mp4",
                            "trim": 6
                        },
                        "start": 0,
                        "length": 6
                    },
                    {
                        "asset": {
                            "type": "video",
                            "src": "https://s3-ap-southeast-2.amazonaws.com/shotstack-assets/footage/cat.hd.mp4",
                            "trim": 5
                        },
                        "start": 6,
                        "length": 6
                    }
                ]
            }
        ]
    },
    "output": {
        "format": "mp4",
        "resolution": "hd"
    }
}