Hello,
I may can not answer your question directly but can give some hints.
I am Typ 1 with a degoogled Fairphone 3 (e/ androird 12)
And I usw the Dexcom 7 in combination with xDrip+.
For my Dexcon I did quite journey to get it working.
- maybe obvious, look at the Libre website I would expect that they give some form of requirement (either specific Phones it is licend to work with (this was the case for Dexcom, my phone was not on the list;)) or specific requirements like Bluetooth version x, android Version X, NFc version? Which you could Compare to the Fairphone 5 specs.
- There are more ways to succes than just one! I as my phone was not supported, first tried to get a hacked version of the official Descom app, its called Build your own Dexcom or something similar. I got a hacked version of the app, and with that the Dexcom app worked as good as it generally does (not great).
After some weeks, I looked for further option (especially the high battery drain, and that I had to uploud my data to some cloud were reasons). I found a community, which developed unofficial diy based apps cloud storage and loop systems, its called nightscout http://nightscout.github.io/.
One of the apps supported by the community is XDrip+ this is the app I used for the last few month. It supports, many differen CGM systems, only the really new once typically need some month to get implemented. There are some Libre options listed. I am not sure about your specific one, but is maybe worth a look, many people do make full Loop systems with xDrip. It is does take much less power and is privacy friendly. There is also something called Open APS.
I hope there will be somebody who can answer your spefic question and wish you all the best.