Despite the idea folks though that Google would be rolling passage indexing by the end of 2020, it has been confirmed by Google that passage indexing has not been rolled out yet.
According to Google,
“Very specific searches can be the hardest to get right. Since sometimes the single sentence that answers your question might be buried deep in a web page. We’ve recently made a breakthrough in ranking and are now able to not just index web pages, but individual passages from the pages. By better understanding the relevancy of specific passages, not just the overall page, we can find that needle-in-a-haystack information you’re looking for.”
Source – Search Engine Land