'How do I add a custom key to mysql information_schema.COLUMNS

Im using this mysql statement SELECT * FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = '$dbck' AND TABLE_NAME = '$tbck' AND COLUMN_NAME = '$field_param'". How can I add a custom key to the mysql information_schema.columns to look like this?

    {
        "Field": "id",
        "Type": "mediumint(5) unsigned",
        "Null": "NO",
        "Key": "PRI",
        "Default": null,
        "Extra": "auto_increment",
        ***"CUSTOM_KEY": "custom_value"***
    }
phpmysql


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