Jeah it is kinda possible, but it‘s not that easy and you have to plan it.
Let‘s say you want to sample an incomming audio on track 8. Now you set triggs on track 8 and programm them to play a sample from the next empty slot. It has to be the next empty slot. After setting your triggs you go ahed, play the track. Than you record on the fly your „thing“ and than you have to be very fast with saving. Dont name it, does take to much time. Save the new sample on track 8 and it will be automatically assigned to the empty slot you programmed the trig with and he‘ll play it back. told ya, not that simple.
Maybe some one here has another idea?