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To involve Start column in the email subject, you should first convert date value in the Start column into text value.
1.Create a calculated column named Startdate with below formula.
=TEXT([Start],"YYYY-MM-DD")
2.Using JSON codes to involve Start column in the email subject
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"children": [
{
"elmType": "span",
"style": {
"padding-right": "20px"
},
"txtContent": "@currentField.title"
},
{
"elmType": "a",
"attributes": {
"iconName": "Mail",
"class": "sp-field-quickActions",
"href": {
"operator": "+",
"operands": [
"mailto:",
"[$Attendees.email]",
"?Bcc=xxxx.com",
"[$BCC]",
"&subject=",
"[$Title]",
",",
"[$Startdate]",
"&body=",
"Dear XXX,",
"\r\n \r\n"
]
}
}
}
]
}
3.Result:
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