Is it possible to set logarithmic scale for the x axis?
No, please see Enable user selectable scaling of plots: linear or log, xmin xmax ymin ymax (also for secondary axis) for all simulation types (#17815) · Issues · KiCad / KiCad Source Code / kicad · GitLab. You might give it an upvote.
In the meantimre you might try the gnuplot command (see for example Simulation Plot XY - #10 by holger)
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Nice, I upvoted. I am plotting with Python currently, but it is not as convenient as having it in the simulator already.