Hi Jérôme,
at the moment, this is not possible, however there is a feature request for implementing such functionality: https://jira.atlassian.com/browse/CRUC-189
Feel free to watch and vote for the issue, as votes help increase the priority of feature requests.
You may also find the following community thread useful:
How do I show whitespace (tabs, spaces) in a crucible review?
Hope this helps!
Themis
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