Can you, in the sense of is it physically possible to do so: of course it's something that can be done.
Should you? Absolutely not! Not even if you plan on installing a 30A receptacle. One important reason is that the main breaker in the RV will not control this outlet, so you don't have a good way of turning off all the power to all the systems in the event of an emergency or to do repair work. (Yes, you can unplug the shore power cord, but in an emergency that does take considerably longer since you need to run around outside.)
Run a circuit from the converter/distribution panel with a properly sized breaker for the wire size (or add on to an existing circuit in an approved manner). Depending on the space in the distribution panel and the breakers already installed, you may not be able to add another circuit, or you may have to replace a breaker with a tandem dual-circuit breaker (i.e. a pair of half-width breakers, not a 240V dual breaker).