There are various exporters that can write JSON or proto OTLP to a file, e.g. s3-exporter and file exporter but what do I do with these files?

Say I want to ingest them into clickhouse using the clickhouse exporter, I could start up a pipeline with OTLP receiver and write a small script to POST the proto blobs to the HTTP endpoint but that feels overly convoluted. Is there some receiver example somewhere that reads OTLP/proto from disk?

I tried using file exporter and can make sense of the generated files, but it’s not clear how to get them back into a pipeline.