<?xml version="1.0" encoding="UTF-8"?> <form> <fields name="schema"> <fieldset name="schema" label="PLG_SYSTEM_SCHEMA_FIELD_SCHEMA_LABEL" > <field name="Custom" type="subform" showon="schemaType:Custom" > <form> <field name="@type" type="hidden" default="Custom" /> <field name="noteCustom" type="note" description="PLG_SCHEMAORG_CUSTOM_DESCRIPTION_LABEL" class="alert alert-info w-100" /> <field name="json" type="textarea" label="PLG_SCHEMAORG_CUSTOM_JSON_FIELD_LABEL" rows="8" /> </form> </field> </fieldset> </fields> </form>