Just an fyi: we've started work on

target-yaml

which writes records into a yaml list or dictionary. This is being created for the Hub's ELTP "publish" step (aka the "Reverse ETL" use case), which pushes metrics data to a yaml file which can then be used in auto-generating the MeltanoHub website. It's still new but if you're interested in collaborating on this target, feel free to drop me a line. https://github.com/MeltanoLabs/target-yaml