Group Binding using custom dates

This is my SAQL query:

"query": 
"q = load \"DTC_Opportunity_SAMPLE\";\n
result = group q by {{cell(Static_4.selection,0,\"value\").asGrouping()}};\n
result = foreach result generate {{row(Static_4.selection,[], [\"value\"]).asProjection()}}, count(q) as 'Count', sum(q.'Column1') as '#', sum(q.'Amount') as 'Amount';\n
result = limit result 2000;\n\n",

The static step:

"Static_4": {
                "broadcastFacet": true,
                "label": "Static",
                "selectMode": "singlerequired",
                "type": "staticflex",
                "values": [
                    {
                        "display": "Week",
                        "value": "Created_Date_Week"
                    },
                    {
                        "display": "Month",
                        "value": "Created_Date_Month"
                    },
                    {
                        "display": "Quarter",
                        "value": "Created_Date_Quarter"
                    }
                ]
            },

I need to replace the date numbers with names but I don't know where to place the code to get that.

...foreach q generate (case when 'Created_Date_Month' in ["01"] then "January" when 'Created_Date_Month' in ["02"] then "February" when...

Any ideas? is that possible?