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It is possible by copying the report's source code and adding the following css as seen in the picture:
You only need to add the blue part of the code, inserted int the .x-grid3-cell-inner class next to the title tag.
To view and copy the source code of the report, open it in a browser window, right-click and choose view source. Then select all and copy it and edit it.
You can test here the result:
Let us know if further support is needed.