The Schema Integrator is quite simple. Just add one or more valid JSON-LD blocks.
The snippet needs to start with <script type="application/ld+json"> and has to end with </script>. Otherwise, it won't get stored.
If a dynamic extractor adds JSON-LD data to the given element, the schema integrator is not able to replace the values! That said, you need to take extra care implementing additional schema blocks - this could lead to dangerous duplicate entries otherwise!