JSON-LD 能否用于自动更新商家 Feed？
Can JSON-LD be used to auto update a merchant feed?
Google 会读取 Schema.org 形式的 JSON-LD 标记以自动更新产品提要吗？
It says that it uses Microdata 但它没有说更新提要时是否会查看 JSON-LD。
For using Automatic Item Update you must set the microdata from
schema.org in your HTML, but I am afraid you won't be able to use
JSON-LD.
Also, keep in mind that with the Automatic Item Update you won't need
to update your feed anymore, it is just for cases where the
price/availability of the product in the landing page has changed but
you haven't updated yet your feed, but you still need to provide feed
with accurate information.
Google 会读取 Schema.org 形式的 JSON-LD 标记以自动更新产品提要吗？
It says that it uses Microdata 但它没有说更新提要时是否会查看 JSON-LD。
For using Automatic Item Update you must set the microdata from schema.org in your HTML, but I am afraid you won't be able to use JSON-LD.
Also, keep in mind that with the Automatic Item Update you won't need to update your feed anymore, it is just for cases where the price/availability of the product in the landing page has changed but you haven't updated yet your feed, but you still need to provide feed with accurate information.