Could you concatenate two variables or two widgets states ? I cannot :(

Hi all, I am not able to concatenate two variable first_name and last_name into a full_name variable using the Combine Text as explained here . When I post it to my backend it show the reference instead the value. Check this out below: "full_name": "<firstName> <lastName>". Do you know how to fix this?

Thanks, Rubens

{

"username": "[email protected]",

"email": "[email protected]",

"mobile": "(11) 95193-3171",

"password": "12345678@",

"full_name": "<firstName> <lastName>"

}