[[EDIT]] I saw that russelhltn posted a similar response at the same time I did, so mine is essentially a duplicate
Do you need help adding this feature to the site?
Just to set expectations, this Forum is primarily a member-to-member help forum, and not a place for Feedback or Functionality Requests. Another reality is that from what we understand, the Church's IT department is not as large as many expect, and Church leadership sets their development priorities based on factors they judge (which may or may not align with our priorities as users!). You will find that many of the issues raised here on the Forum are items that we all struggle with as well, but the place to submit your feedback is through the standard Feedback mechanism (the link at the bottom of most every page on the Church website). That is the way to get in contact with the Church's decision-makers.
For now the best interim solution I can think of is to express this to your Bishop, and request that he ensure all ward members are aware of their status and alerted a few months before it expires. Obviously not ideal and more effort is required, but it would at least be a workaround until whenever the functionality is added.