Generate {num_variations} variations of this Yelp review: "{seed_text}"

The original is categorized as '{seed_category}'. Generate variations that:
1. Stay in the '{seed_category}' category (at least 60%)
2. Sound like they belong to '{other_category_1}' or '{other_category_2}' but are actually '{seed_category}' (hard negatives, at least 20%)

Output as JSONL with fields: text, label (where label={seed_label})
One JSON object per line.