How to set request specific data(Variables) with app.fetch()?

[MellKam]

I'm using Hono as a router and RPC client in my Astro app. I'm trying to figure out if there's a way to set variables with the .fetch function. I have middleware on the Astro side handling authorization, so I want to pass user and session objects to Hono when making a request. But it looks like fetch only takes bindings as the second parameter.

export const app = new Hono<{
	Variables: {
		session: Session | null;
		user: User | null;
	};
}>()
	.basePath("/api")
	.route("/auth", authRouter)
	.route("/categories", categoriesRouter);
// ...

export const ALL: APIRoute = (ctx) => {
	return app.fetch(ctx.request, { user: ctx.locals.user, session: ctx.locals.session });
};

I tried passing user and session as Bindings, which works, but they don’t seem ideal for data specific to each request. The ultimate fix might be to create Hono middleware and skip using Astro locals, which I’ll probably do, but I’d still like to know if there’s a way to achieve this directly.