Creation of large amounts of small files using Batch scripting with varying naming schems and contents defined by 2 text files

I’m trying to make a batch file to help generate a large amount of files that are similar but differ in name as well as called variables inside the files

the file would contain a variable-name that is retrieved from a list in a separate text file with around 1000 names, and call to a variable-function from another text file with around 40 different functions – this would need to create one file for all 40 functions for each name about 1kb each. As this is tens of thousands of files it would take a very long time to create manually.

the name of the created files would need to contain the variable-name followed by the called variable-function and then made as a file with a .json extension

for context this is to create an addon for a game and involves a lot of repeated but simple files to define alternate creatures

I am not sure how to do this with a batch file or if it could be done with one. I don’t have much experience using them (but with an example of something(s) similar I can figure it out.

If a batch file wont work, what should I use to accomplish this?

example of the output file below

file name: variablename_variablefuntion.json

{
  "target": "variable-name",
  "features": ["variable-function"],
  "aspects": ["variable-function"],
  "forms": [
    {
      "name": "variable-name",
      "labels": ["variable-function"],
      "aspects": ["variable-function"]
    }
  ]
}