Hi guys, just wondering if CX offers a "book and upgrade using Asiamiles" similar to BA's upgrade using Avios ?

I was checking the asiamile website and saw this:

https://www.asiamiles.com/en/terms-a...de-awards.html

And I am looking to upgrade from PE to J. When I check fares from LHR to HKG, it is about £1800 return but the booking class is E. When I choose the £2111 option, it is done in booking class R. However, I don't see an option to "upgrade to the next cabin using Asiamiles" ? Neither do I see a search feature similar to BA's website "book with cash and upgrade using avios" ?

Is there one ? And I assume based on the website, booking class E is a definite non upgradeable fare ?