Text convern to curves (Ctrl+Q), and in Contour docker (Ctrl-F9) make Inside contour.




Enable Snap to objects option (Alt + Z) and draw auxiliary path with Free Hand Tool (enough lines of the two nodes angles unifying text and contour).



A simple click with Instrument Smart Fill Tool make a separate object.



Remove contour and path, break text on separate letter (Ctrl + K). Fill sides and letters with Gradients (G).



vector file:  side_txt.cdr

Sorry my english is bad, if you will find errors tell me please, I shall correct. Thanks.