[brudgers]

Adobe Digital Negative (DNG) [1] is that sort of standard (sort of) and there are manufacturers who use DNG as the RAW format in their cameras. Leica tends to use DNG as it's RAW file format. [2]

[1]: https://en.wikipedia.org/wiki/Digital_Negative

[2]: https://www.bhphotovideo.com/c/product/1082939-REG/leica_108...