There are no standard text codes available for journals.
However, in recurring journals you can have the description update using the following:
Changing description, the posting date is used and will return a text variable into the description:
%1 Day Number of the Month (1, 2, 3….31)
%2 Week of the Year
%3 Month Number of the Year (1, 2, 3….12)
%4 Month Name
So "%4 Dimension Allocation for Rent", with a posting date of July 20, 2022 will post a description of ‘July Dimension Allocation for Rent’.