It's about the C4 model for visualizing software architectures: https://c4model.com/

Using PlantUML and a set of !include PlantUML "C4" files, this satisfies most of the items on my list: https://github.com/RicardoNiepel/C4-PlantUML

Gaps: Have to extend it a bit to support network topologies. No integration (that I see) with network mapping software.