If i understand : it's an automatic text according to qcode ?
Maybe there another way to do this ?

(but still : have a self.lemcode can be a good idea).

Hopefully there is, because otherwise I'm screwed. :)
More seriously, yes, there are workarounds, and maybe this case is unusual enough to ignore at this point.
But we seem to agree on the possible benefits of having access to the question code; and what is more, not having it seems a bit arbitrary, at least to me.

When i say "automatic text" i think of another setting somewhere. Not a workaround :).

Maybe some GLOBAL em function ?

For example:
{GLOBAL:imagetext}
{GLOBAL:soundtext}

.

See https://github.com/LimeSurvey/LimeSurvey/tree/master/application/core/plugins/expressionQuestionHelp
for a plugin solution

Oh!! I already see this plugin as the default plugin in the core LS5. I will close this ticket then. Thank you @DenisChenu , we do not need to implement this seperately.