Tangential: No Grammar to Rule Them All: A Survey of JSON-style DSLs for Visualization https://arxiv.org/abs/2207.07998 https://arxiv.org/abs/2207.07998 Both

Tangential: No Grammar to Rule Them All: A Survey of JSON-style DSLs for Visualization https://arxiv.org/abs/2207.07998 https://arxiv.org/abs/2207.07998 Both Vega and Echarts are covered, among others.