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The builder draws a node’s configuration form from the schema its handler declares. This is what lets an extension be fully configurable without shipping any front-end code.

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Start with the schema

configSchema() on your handler returns the schema the builder validates against and renders from:
The full vocabulary is in the Builder config schema reference.

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Rules

Prefer backend schema and generic rendering. If the generic renderer can express the control you need, use it. A schema-driven field works everywhere, survives front-end refactors, and needs no build step. Bespoke Core overrides only when the schema cannot express the UX. Core nodes may ship a hand-written Vue component, but only where a schema-driven control genuinely cannot do the job — not because a bespoke component would look nicer. A Plugin cannot inject arbitrary Vue components. The builder front end is compiled before your Plugin is enabled. There is no runtime component injection, by design: it would mean shipping unreviewed code into a running admin surface. If the schema renderer cannot express what your node needs, the fix is to extend the renderer in Core, not to work around it. Solution components need the approved build and publish contract. A Solution may contribute front-end code, but through the agreed Vite glob and publish contract — not by writing into the application’s source tree.

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When the renderer is not enough

That situation is a Core change, and it is worth raising rather than working around. Extending the schema renderer benefits every extension that hits the same limit; a one-off override benefits one node and has to be maintained forever.