This question contains a couple of unrelated non-answer answers (one of which has been selected as correct!), a link to a corresponding duplicate thread that no longer exists, an answer regarding the read-only aspect of mail attachments, an answer regarding orientation of text in table cells, and a further query about the lack of a 180 degree choice within character style text rotation options. To make matters worse the original question does not even provide an example, but presumably the reference to “chart” simply meant a graphic object. Here goes cleaning this mess up…
Text (character style) rotation: There is an assigned bug (FDO#48804) relating to adding an option for rotating text (via Format > Character) 180 degrees. There is no current ETA of when it will be done, but this is being worked on.
Text (box) rotation: A temporary workaround (until the enhancement above gets done) is to insert a text box, enter your text, right click (on the frame) > Position and Size… > Rotation tab and set the Angle to 180 degrees.
Text (table property) orientation: As @JohnD mentions this can be done via Table > Table properties… however these text options are only Horizontal, Vertical (equivalent to 270 degree character style rotation for left-to-right text), and Use superordinate object setting i.e., use the table orientation.
Graphic object rotation: There is currently no facility to allow basic rotation of a graphic object within Writer. This is an old enhancement request (FDO#34423 and AOO#3545) that is not seen as a priority due to existing function with Draw. If you desire a 180 degree rotation however, it is possible to achieve this by right click (on the graphic) > Picture… > Picture tab and check both Vertically and Horizontally.
It is always helpful to be as clear as possible about the exact type of rotation / orientation concerned and the type of object to which the action is being applied. Hopefully this is somewhat clearer now.