JetBrains has a DSL creation language called MPS (Meta Programming System)[1]. I stumbled upon it while exploring their various offerings. I haven't played around with MPS but came across Dutch Tax system's use of MPS in their case studies, it's near the end of the page [1].

You will find a decent info to get started here[2]

[1] https://www.jetbrains.com/mps/ [2] https://www.jetbrains.com/mps/concepts/domain-specific-langu...