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The prefect guide mentions that string blocks and Json blocks are deprecated and Variables should. be used instead. I have a question on how to replace the Json Blocks with variables.  - rather than creating a separate variable for each key . For eg: `cis_endpoint_user = JSON(`
    `value={`
        `"url": os.environ.get("CIS_ENDPOINT_URL"),`
        `"user": os.environ.get("CIS_USERNAME"),`
    `},`
`)`
`self.save_block(cis_endpoint_user, "cis-endpoint-user")`