Hi Cesar,
Welcome to the forums

As you've discovered, the metronome click doesn't render to audio.
The following work-around should let you achieve what you are after.
1. Go to "Opt | Preferences" and follow #3, #4, #5 on the image below to set the metronome so that it plays back throughout the song.

2. Generate the bass track.
3. Right click on the speaker icon on the right side of the task bar.

4. From the pop-up menu, select "Recording Devices".

5. Now scroll up/down until you find an option that lets you record what is playing through the computer system. For my soundcard, this is called "What U Hear".

6. Activate "Record Audio" and let the song play through from beginning to end. The audio file that will be recorded will be "what the computer 'hears'" and should now contain the metronome sound.

Hope this helps,
Noel