Print parquet size while using Flink FileSink.forBulkFormat

Question

I am using 1.17 Flink and I want to print the size of parquets that FileSink creates. I am using forBulkFormat. I need an indication for parquets size that I am uploading to blob storage for monitoring.

FileSink.forBulkFormat(s3SinkPath, new ParquetWriterFactory<>(builder))
                    .withBucketAssigner(new CustomDateTimeBucketAssigner())
                    .withRollingPolicy(new OnCheckpointRollingPolicy())
                    .build(); 

The only solution I found is the link I attached but because some of the fileSink classes declared as internal I can't implement this solution in advance Flink version like 1.17 using this link