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Winder OjedaWinder Ojeda 

Place a Dynamic Text on the Wave Analitycs designer

I am designing a report in analytics and I have found the problem that I can not find the way to place a dynamic Text on top of a table.
If I press ctrl + e I see the json of the dashboard but I do not see how in the attribute I can add today's date
For example
"text_2": {
    "type": "text",
    "parameters": {
        "text": "Today is" + now (),
        "textAlignment": "center",
        "textColor": "# 091A3E",
        "fontSize": 20,
         "tooltip": ""
      }
},
Is it possible to do this by modifying the json? because I try to save and he tells me that the json is invalid.