You're looking for a JSON to VCF (Variant Call Format) converter and an informative paper on the topic. Here's some information:
Converting JSON data to VCF format is often necessary when working with genetic data stored in JSON format, such as data from the JSON-based format used by the Genome Analysis Toolkit (GATK) . There are several tools and libraries available for this conversion. json to vcf converter
VCF is a file format used to store genetic variation data, such as single nucleotide polymorphisms (SNPs), insertions, deletions, and structural variations. It's a widely-used format in genomics and genetics research. You're looking for a JSON to VCF (Variant