SPO-Column-Formatting-Example05-Owner.json

{
    "$schema": "http://columnformatting.sharepointpnp.com/columnFormattingSchema.json",
    "debugMode": true,
    "elmType": "div",
    "children": [
        {
            "elmType": "span",
            "style": {
                "padding-right": "8px"
            },
            "txtContent": "@currentField.title"
        },
        {
            "elmType": "a",
            "attributes": {
                "iconName": "EditMail",
                "class": "sp-field-quickActions",
                "href": {
                    "operator": "+",
                    "operands": [
                        "mailto:",
                        "@currentField.email",
                        "?subject=Check task status - ",
                        "[$Title]",
                        "&body=Please update your task status\r\n---\r\n",
                        "[$Title]",
                        "\r\nThanks."
                    ]
                }
            }
        }
    ]
}