feat: standard json schema support #948

Job	Run time
Desktop (Electron) tests (macos-latest, macOS)	1m 33s
Web tests (browser matrix) (firefox)	1m 46s
Desktop (Electron) tests (ubuntu-latest, Linux)	57s
Web tests (browser matrix) (chromium)	1m 23s
Web tests (browser matrix) (webkit)	1m 25s
Desktop (Electron) tests (windows-latest, Windows)	2m 5s
	9m 9s

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