VK_KHR_get_physical_device_properties2(3) Manual Page

    // Get features with a hypothetical future extension.
    VkHypotheticalExtensionFeaturesKHR hypotheticalFeatures =
    {
        .sType = VK_STRUCTURE_TYPE_HYPOTHETICAL_FEATURES_KHR,
        .pNext = NULL,
    };

    VkPhysicalDeviceFeatures2KHR features =
    {
        .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2_KHR,
        .pNext = &hypotheticalFeatures,
    };

    // After this call, features and hypotheticalFeatures have been filled out.
    vkGetPhysicalDeviceFeatures2KHR(physicalDevice, &features);

    // Properties/limits can be chained and queried similarly.

    // Enable some features:
    VkHypotheticalExtensionFeaturesKHR enabledHypotheticalFeatures =
    {
        .sType = VK_STRUCTURE_TYPE_HYPOTHETICAL_FEATURES_KHR,
        .pNext = NULL,
    };

    VkPhysicalDeviceFeatures2KHR enabledFeatures =
    {
        .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2_KHR,
        .pNext = &enabledHypotheticalFeatures,
    };

    enabledFeatures.features.xyz = VK_TRUE;
    enabledHypotheticalFeatures.abc = VK_TRUE;

    VkDeviceCreateInfo deviceCreateInfo =
    {
        .sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO,
        .pNext = &enabledFeatures,
        ...
        .pEnabledFeatures = NULL,
    };

    VkDevice device;
    vkCreateDevice(physicalDevice, &deviceCreateInfo, NULL, &device);