Webhook string problem

[TheRafa]

Hi,

My webhooks sent a chat message to Discord.

Webhook Body:

{
"username": "SomeUser",
"content": "this is my content"
}

When I try this, everything is ok and Discord shows the message 🙂. 

I tried another way because I know that I will use more complex string expressions in the future, using column images, etc.

I used a virtual text column [my string] with this formula expression

 '"content": "this is my content"'

(take attention on my quotation marks)

Then I changed the webhook body to:

{
"username": "SomeUser",
<<[my string]>>
}

When I try this last webhook I receive an error . 

I do not understand why.