最后我做了这个：

export const action = async ({ request }: ActionArgs) => {
  const formData = await request.formData();
  const allFormDataFields = Object.fromEntries(formData.entries());

  // first extract the intent
  const intent = allFormDataFields._intent as keyof typeof FormIntents;

  if (intent === FormIntents.add_transaction) {
    // now parse with relevant zod object
    const result =
      myZodObject.safeParse(allFormDataFields);
    if (!result.success) {
      return badRequest({
        errorFields: result.error.flatten(),
      });
    }
    // do stuff
  } 
  if(intent === "something else"){
    // do other stuff
  }