How to insert SCTE-104 OR GPI signal on PGM

I have an ATEM 2 M/E Constellation HD + ATEM 2 M/E Advanced Panel 20 and an ATEM CM5000 connected to a PGM output, to which I need to send the signal via SDI (SCTE-104) or GPI to indicate whether I'm on air or going to a commercial break. How can I send either of these signals from the Advanced Panel 20? Any ideas or solutions?
In case it helps, I also have a "GPI & Tally Interface" (which only uses the Tally outputs) ... but I don't know if it can be used to input the signal through GPI and have the ATEME "allow" it to pass to the PGM output. Please clarify my doubt.
In case it helps, I also have a "GPI & Tally Interface" (which only uses the Tally outputs) ... but I don't know if it can be used to input the signal through GPI and have the ATEME "allow" it to pass to the PGM output. Please clarify my doubt.