AWS Athena show only first row of each tables

Hello, I have data in the AWS S3 bucket in the format year/month/day/hour/file1.json, file2.json..... file6.json.

In the JSON file, the data are not separated by coma or new line. {"key":"value1"}{"key":"value2"}{"key":"value3"}.... I use AWS Glue Crawler and get a partitioned table. But when I look at this table in the Athena, I see only the first object from each file (from each folder {"key":"value1"}). I understood that the problem with the JSON files. How do I change it with ETL Job or with Lambda?

Thank you!