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About BucketIAMMember you can just do a create without importing, in this case it won't throw an error that the resource already exists

Thanks for the tip, @astonishing-energy-53370. I have tried some imports so far and have a feeling that only about 30% of imports work. I do the same way as described in "import" section in each API method documentation. Maybe, this technique may work for some resources fine, but for others this is not convenient