How to describe OpenAPI?

[OlegKunitsyn]

#[JsonRPCAPI(methodName: 'product.echo', type: 'POST')]
class JsonRpcProductEchoMethod
{
    public function call(EchoDto $dto): EchoDto
    {
        return $dto;
    }
}

produces unexpected echoRequest and echoMainRequest schemas

product.echoRequest:
    type: object
    properties: {  }
    required: {  }
product.echoMainRequest:
    type: object
    properties: { jsonrpc: { type: string, format: '', default: '2.0', example: '2.0' }, method: { type: string, format: '', default: product.echo, example: product.echo }, params: { $ref: '#/components/schemas/product.echoRequest' } }
    required: [jsonrpc, method, params]
EchoDtoResponse:
    type: object
    properties: { jsonrpc: { type: string, format: '', default: '2.0', example: '2.0' }, tenant: { type: string, format: '', default: '', example: '' }, product: { type: App\Dto\ProductDto, format: '', default: '', example: '' } }
    required: [jsonrpc, tenant, product]