CBTransfer tool upload with custom datatype

I’m trying to upload data to Couchbase server 4.5 from excel file using cbtransfer tool. It is uploading data but my problem is i want to specify datatype for particular value. If there is no character in any value cbtransfer as default it is considering as integer and uploading as integer. But i want to upload as string to couchbase.

I have checked in excel it contain double quotes in data, still cbtransfer considering it as Integer and it is value in document is Integer. Is there any way to specify particular column value as string while upload using cbtransfer ??