Execution data cannot be modified via custom trigger node

Questions
1

I’m creating my own trigger node (webhook) and I want to set some custom execution data when accepting a request.

From the documentation and n8n implementation, I found that Execution Node uses ctx.getWorkflowDataProxy(0) to modify execution object. It seems that Trigger node itself doesn’t accept this method:

	async webhook(context: IWebhookFunctions): Promise<IWebhookResponseData> {
		console.log('🔔 Webhook request received');
		const req = context.getRequestObject();
		const bodyData = context.getBodyData();
		const httpMethod = req.method?.toUpperCase() || 'POST';
		// error here - only `execute` method accepts this
		// const dataProxy = context.getWorkflowDataProxy(0);
    }

Any workarounds?