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I'm trying to achieve dynamic contents from a trigger action, below is my open API code

{"/public/webhooks/flowModel/{flowModelId}/step/{stepId}": {
 "post": {
 "tags": [
 "POST"
 ],
 "summary": "When step is submitted",
 "description": "This operation triggers...",
 "operationId": "WhenStepSubmitted",
 "consumes": [
 "application/json",
 "text/json",
 "application/xml",
 "text/xml",
 "application/x-www-form-urlencoded"
 ],
 "produces": [
 "application/json",
 "text/json",
 "application/xml",
 "text/xml"
 ],
 "parameters": [
 ...
 ],
 "responses": {
 "200": {
 "description": "OK",
 "schema": {
 "type": "object"
 }
 },
 "default": {
 "description": "OK",
 "schema": {
 "type": "object"
 }
 }
 },
 "x-ms-trigger": "single"
 },
 "x-ms-notification-content": {
 "description": "Webhook",
 "schema": {
 "$ref": "#/definitions/WebhookNotification"
 }
 }
 },

 "WebhookNotification": {
 "type": "object",
 "properties": {},
 "x-ms-dynamic-schema": {
 "operationId": "GetStepFieldDict",
 "parameters": {},
 "value-path": "Schema"
 },
 "x-ms-dynamic-properties": {
 "operationId": "GetStepFieldDict",
 "parameters": {},
 "itemValuePath": "Schema"
 }
 },

 "/public/dynamicProperties": {
 "get": {
 "tags": [
 "GET"
 ],
 "summary": "GetStepFieldDict",
 "operationId": "GetStepFieldDict",
 "consumes": [],
 "produces": [
 "application/json",
 "text/json",
 "application/xml",
 "text/xml"
 ],
 "parameters": [
 {
 "name": "ngrok-skip-browser-warning",
 "in": "header",
 "required": true,
 "type": "boolean",
 "default": true,
 "x-ms-visibility": "internal"
 }
 ],
 "responses": {
 "200": {
 "description": "OK",
 "schema": {
 "type": "object"
 }
 },
 "400": {
 "description": "Invalid type specified"
 },
 "default": {
 "description": "OK",
 "schema": {
 "type": "object"
 }
 }
 },
 "x-ms-visibility": "internal"
 }
 }
}

response from GetStepFieldDict is

{
 "type": "object",
 "Schema": {
 "EmailSubject": {
 "type": "string",
 "description": "EmailSubject"
 },
 "EmailBody": {
 "type": "string",
 "description": "EmailBody"
 }
 }
}