Testing Yahoo Finance API
First, try the URL in your browser. I requested
https://query1.finance.yahoo.com/v7/finance/options/F
Then, make it pretty. I copy and pasted the whole result into https://jsonformatter.org/json-pretty-print (just do a each for online JSON pretty).
The pretty JSON is included below after deleting all of the option data that makes it huge (used the GitHub Dev environment to delete it.
From this, we see that regularMarketPrice is likely the key we need.