Yes, but with limitations. Firstly, once you are well trained and have completed a good number of tests you get a sense for your FTP from a range of efforts. Problem for a lot of people is that they don’t ever do long sustained efforts (approx 1hr) so they don’t really get a feel for it.
Secondly, there is a issue around completing the efforts on a hill. If the hill is steep and you are getting out of the saddle regularly your power output may be different to what it would be in the saddle. Also if the hill is not a smooth gradient, you may have bursts of power that skew your data.
The third issue is around repeating them as intervals. The rest between the intervals, the number and the consistency would skew the data. For example, there is a big difference between six 15 minute intervals with a 2 minute rest, than three intervals with a 10 minute break in between.
Everyone is different, so would respond differently to the protocol you have used relative to their FTP. You can only find out when you start undertaking training using the numbers.
Final point, if you don’t do a consistent repeatable protocol, it is hard for you to determine to what extent our training is having an impact.
So in summary, it would give you a number somewhere in ball park, but there are better options
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