You can go to Settings > Tempo & Pitch, turn on Send Custom MIDI and enter B0 2C 7F into the code field. That would send CC 44 on channel 1. To send on a different channel, you can change that second digit (in hex code: 0 is channel 1, F is channel 16).
Then edit a song and enter the desired tempo into the Tempo field, then view the song and click the tempo button to send it. While it's sending, you can click the MIDI icon in the top toolbar and look at the Activity Log to confirm the outgoing data.
You can use one of the Auto-Stop settings on Settings > Tempo & Pitch to stop sending the tempo messages after a short time.