Data source hook - template has got a syntax error and could not be compiled

I have configured the data source hook to send updates to an HTTP endpoint whenever there is an insert, update, or delete. However, I am encountering the following error:

"body": {
    "Type": "Other",
    "Email": "admin@email.com",
    "Title": "Admin",
    "Company": "",
    "Attended": "Attended",
    "Last Name": "This template has got a syntax error and could not be compiled: Missing helper: \"Last\"",
    "Telephone": "-4555",
    "First Name": "This template has got a syntax error and could not be compiled: Missing helper: \"First\""
}

Could this issue be related to the spaces in the key names?

Worked after adding square brackets.

“Last Name”: “{{[Last Name]}}”,

“First Name”: “{{[First Name]}}”,