Generate JSON graph

[stereobooster]

Idea: option to generate graph in JSON format.

1. Than this data can be embedded in HTML data-graph=...
2. Than it can be read from JS and fed to graph lib, for example https://github.com/dagrejs/graphlib
3. And we can add interactivity with JS

Examples: https://beoe.stereobooster.com/examples/vizdom/.
Implementation: https://github.com/stereobooster/beoe/blob/main/packages/demo/src/components/vizdom.ts

This can be alternative approach to animation. Related:

• more animated #1461
• animation: Think about how to recreate this #1485

[alixander]

This is a good idea for a function in the Javascript version