Per-field rendering errors, keyed by field name. null if all fields succeeded.
output
output:Record<string,unknown>|null
Successfully rendered display field values, keyed by field name.
Most values are strings, but Display v2 templates can produce structured
JSON values (objects, arrays) for fields that reference non-string Move
types or use the :json transform.
Per-field rendering errors, keyed by field name.
nullif all fields succeeded.