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A popular turbofan with civilian fighter jets is the TFE731 with 3,500–4,750 lbf [1] and can be fitted to i.e. the L39 Albatross trainer jet. [2]

Supersonic jets like the F5 might use something like the GE J85 which produces a base 3,500 lbf or 5,000 with an afterburner [3].

[1] https://en.m.wikipedia.org/wiki/Garrett_TFE731

[2] https://en.m.wikipedia.org/wiki/Aero_L-39_Albatros

[3] https://en.m.wikipedia.org/wiki/General_Electric_J85

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civilian fighter jet ? Is that a US thing ?

Mostly. Ironically the most popular civilian fighter jet is a Soviet era Czech design (the aforementioned L39).

Even in the US though, they are relatively limited in where they can fly and require an experimental aircraft authorization. It’s relatively impractical in most of Europe because they’re not allowed to fly above populated areas except to take off and land (at least in the US)

You don't actually have to worry about any of this stuff, if you have the money to buy one of these you also have the money to register it in a third country.

>It’s relatively impractical in most of Europe because they’re not allowed to fly above populated areas except to take off and land (at least in the US)

FWIW this is mostly a US problem.

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