At first glance your REST syntax looks correct. Your event would have two request variables in it ("visitorIdentification" - type String, and "sample" - type Data Grid).
There's no way to directly write that to a table, though, so you'll need to pass the data grid as an input variable into a process node and then use DS2 (for example) to iterate through the table/columns to create and issue the insert statements using the SQLSTMT package.
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