This should be „last week run activities“ and not „last run“ if I’m right. There is no other datafield available. You may look for a third party watchface that could provide this.
All of the data points on their are adjustable. I have the center top data as the weather.
To change press hold the left center button, select "Watch Face". You can scroll up/down to totally change the face, or to change... press the upper left button and select "Customize". Select "Data " ... then you will get a blinking data field on the watch face, starting upper left and working clockwise as you click the upper right to accept. To change the blinking data field, scroll up and down with the left buttons. To accept and move to the next press upper right button.
When done and went through all data fields, press upper right one last time and "Apply".
Wow, sorry not sure how I missed that, in my head the whole time I had it that he wanted to change it FROM last ride to something else. duh - read! lol
