I have a smaller screen (G830) but with progressive lens inserts on my Rudy Project’s everything is pretty clear to read.
If you are farsighted and need bifocals for close-up vision but don’t ride with prescription glasses, you could try stick-on reader lenses. Example: Amazon.com: STICKTITE LENS
One of my ride buddies uses them and says it’s made a major difference.
I don’t know what’s possible to do on a Garmin Connect IQ app, but what if there was a large number option under Settings. If enabled that section of app could look something like this where the numbers are as large as current power in the rainbow arc.
I don’t think it should be the default as it’s too cryptic for those learning how the app works.