I changed to use this one.

*** Test Cases ***
Run All API Test Cases
    ${data}=    Load Json From File    ${CURDIR}/../data/new_username.json    encoding=UTF-8
    FOR    ${item}    IN    @{data}
    ${tc}=    Get From Dictionary    ${item}    tc
    ${name}=    Get From Dictionary    ${item}    name
    ${job}=    Get From Dictionary    ${item}    job

    ${payload}=    Prepare Payload    ${name}    ${job}
    ${response}=    Send Create User Request    ${payload}
    Validate Response    ${tc}    ${response}    ${name}    ${job}
    END

Thank you so much.