Yea, after a day of research, seems this function does not exist natively in Premiere Pro. Seems like it would be very simple to include this feature, though. The time it will take to manually produce multiple videos from a single timeline would be costly and crazy impractical, for sure. Could cut the sequence apart and nest, and export all of the nests, but then that permanently mutilates clips on the timeline, gets unnecessarily cluttered, difficult to change each nest after a cut is made, etc. Unfortunately, might be back to Vegas to batch render (or batch queue) multiple videos from a single timeline. That is a snap.
Formal request to Adobe: Please add a feature to batch export multiple videos from a timeline using markers, marker ranges, chapters, chapter ranges, etc.