could you please tell me how to do that? :)
That's pretty easy to do.
First you need to have gamma workflow setup correctly ("Rendering" -> "Gamma/Lut Setup".
I keep it this way:
input and output to 2.2 (whereas output is more a personal decision, I have it setup to 2.2 for scripting reasons, normally - in an exr workflow - I'd tend to use 1.0)
After that the important step is documented here... If you load a bitmap texture you have to check "override" and set it to 1.0, this means the map will be loaded with gamma 1.0 (which will obviously look too bright in your editor but that's ok)