Images Not Caching about jekyll-pwa HOT 1 OPEN

I think there're two options to cache images with Google Workbox:

1. use precache_glob_patterns, you can add the filepath of images into the regexp so that they can be precached. But if there're too many images to precache, the installation of service-worker will take a lot of time. So I think only precaching some critical images seems like a better choice.
2. use runtime_cache to cache images embedded within every post in runtime.

I think you can treat different images with different strategies:

precache_glob_patterns:
    - "{js,css,fonts}/**/*.{js,css,eot,svg,ttf,woff}"
    - index.html
    - "my-critical-image/path/*.{png,jpg}"
runtime_cache:
    - route: /img\/embedded\/within\/my\/post
      strategy: cacheFirst

from jekyll-pwa.