2018 Catalina 281 dds optional fireplace

[ChuckinVa]

We have a 2018 Catalina SBX 281dds and were wondering how easy it would be to add a fireplace to the unit. The load center shows a 15 amp breaker for the microwave/ Optional FP which I Take to mean Fire Place. I have seen a video on YT that shows a similar situation where the unit was actually roughed in for the fireplace with a receptacle behind a faux wall in the cabinet under the TV. If any one has the optional fireplace, can you advise if the Microwave shares a breaker with the fireplace? Thanks CHUCK

[SeaDog]

Many of the installed fireplaces share a broker with the microwave with that said they have a switch installed so that you either select microwave or fireplace but not both.