How to send a carrier at a specific frequency?

I would like to Tx a carrier on the 868.300.000 Mhz frequency.
On release 0.82.3, when I use Sub-GhZ / Test / Carrier / CC1101 Basic Test :
Nearest frequency available is 868.349.853 , that is too far from the desired freq.

My Region is FR
433050-434790 kHz
868150-868550 kHz

Does an app / trick exist to set a carrier at this specific frequency ?
Thank you !

You can edit frequencies in /subghz/assets/setting_user, after renaming it from setting_user.example.