We already support sum(A:D) to calculate rowwise sum from column A to D, but for other statistics, user needs to get it via Statistics on Rows in the past.
The following are added in Origin 2021b.
sum(A:D)_mean
sum(A:D)_sd
sum(A:D)_min
sum(A:D)_max
sum(A:D)_n
sum(A:D)_median