I have been riding an MTB eBike from 2013-2018 (only bike I have been using) and I even got rid of the 25km/h speed limit we have here in Germany. I started using TrainerRoad end of 2018 with an FTP of 230 (being 38 years old with 72kg). I don’t think that looks like a bad FTP for never having trained before.
So please ignore people that say it has nothing to do with biking. The important thing is what you do with the engine supporting you. For sure you can cheat by using 100% of the engine power. But you can also adjust the engine support so that it perfectly fits to your current fitness level. When I was not fully rested/healthy I simply used more engine power to support my ride.
And do believe me, if you want you can still sweat a lot on an eBike. On good days I usually drove with only 30% power (which means I am putting 100 Watts on the pedal and the engine adds 30 Watts) - other people joked about me that these 30% are probably only required because of the extra 10kg that I am carrying around due to the heavy engine + battery. But I loved the freedom to simply be able to increase the engine support at the end of a long ride and that my speed did not drop on days where I wasn’t feeling totally well.
There might be eBikes that work differently, but the ones with the Bosch engines have a power meter internally and they simply add a certain percentage of your watts to your pedaling. If you don’t pedal, the engine will not do anything. And for the newer ones you can even define the power support curve yourself with an app on your cell phone.
Go for an eBike - it is better than stop using a bike at all.