Thanks. It is speculative. I think I read it on a forum devoted to Tempest/GCAP.Been trying to find this figure for so long, thank you so much
Dating back to 2020 - before the Tempest programme link up with Japan - here is a RR press release webpage which might be of interest.

Rolls-Royce develops world-first electrical technology for next-generation Tempest programme
Rolls-Royce develops world-first electrical technology for next-generation Tempest programme

Whether that technology will be transferred into a Japanese design based engine I do not know.
PS
DSEI Japan 2023: IHI, Rolls-Royce progress GCAP fighter engine
Japan's IHI Corporation and the UK's Rolls-Royce have initiated development of the engine that will power the proposed future fighter aircraft under the Global Combat...

While the GCAP programme has not yet been launched (a yes/no decision to choose a design and take it to production is 1-2 years away), the aim is to produce a prototype engine by the late 2020's and have the engine used in the fighter by the mid-2030's. So, around 10 more years before it goes into production. I appreciate that TEI will be aiming at a lower level of technology with TF35K. Can a finalised TF35K be tested, certified and put into production in the next 5 years? I don't suppose that is actually critical since it is not the only engine that can be used to power the KAAN.
PPS
Any news on Azerbaijan, Pakistan involvement?
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