Good morning LiShiYu,
In the case that I wish to import a satellite product, or a variable, which is not in the ingestion definitions, then I use the coda module. Hence, two options exist:
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Either you read the satellite product using coda and transform the file into a hard-compliant file. An example can be found here, Problem with HARP/Python within a loop - HARP - Atmospheric Toolbox. You basically open the file, ingest the parameters you want using coda.fetch and output into a new harp compliant file.
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You use harp import product to import the already harp-compliant satellite file, and you add a parameter to the product dataframe using coda.fetch. Then again you output to a new file that you can work with.
Best wishes,
MariLiza