Who is your target customer? I periodically have to do this sort of mapping so it seems helpful to me, but typically they're one-off things so I can't justify purchasing a product.
Our customers have a recurring need to map data and use those mappings, such as onboarding client, normalizing data from multiple systems, or build and maintain data pipelines. All of them have the common denominator of continually having to map and maintain these mappers (e.g. n clients). You can learn more here https://www.lume.ai/use-cases. Of course, if we may be of help, reach out to nicolas@lume.ai