Because they're not generated by the game, they're inserted at the driver level outside of the game. Some have referred to this as "fake frames" or you could simply consider it a smoothing effect in the transition between frames. Regardless, despite how AMD spins this you are not increasing the actual game FPS, thus there is nothing for a 3rd party program to "show".
Ryzen R7 5700X | B550 Gaming X | 2x16GB G.Skill 3600 | Radeon RX 7900XT
Ryzen R7 5700G | B550 Gaming X | 2x8GB G.Skill 4000 | Radeon Vega 8 IGP
Ryzen R5 5600 | B550 Gaming Edge | 4x8GB G.Skill 3600 | Radeon RX 6800XT