Unfortunately, there is not. If you are doing a local file import then the "code" is actually a set of REST calls to the SAS Viya microservices. The most important of these is a POST to the CAS Management service to stream the data to the CAS server to have the table created. Internally CAS Management is using the CAS Java client to invoke a table.upload CAS action.
If you are importing an unloaded table from a caslib, then the code for performing the import is contained in the corresponding Job Definition used to run the Import job. All of these job definitions are running CASL code, and they should be publicly viewable using the Job Definitions service REST API to retrieve them. The returned definition will have a "code" member that contains the parameterized CASL code block that it uses.
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