Bulk Update Features

When bulk updating Features, I would like to use some literals and keys to update the existing values of all Features, as well as to reference to another field of that Feature, like:

• for each Feature add a prefix "XYZ_" to the value in field AAA

• for each Feature, update the value in field AAA to "text1 {current value of field AAA} text2"

• for each Feature, update field BBB to "text1 {current value of field AAA} text2"