Wow, Great question. Here are my thoughts: There are two issues to overcome. you require eighth note resolution and you want it at the end of your song.

Band-in-a-Box allows you to enter four chords to a bar which traditionally means one chord per quarter note. Change the tempo at the bar so two bars of the chord sheet equals 120 BPM. Then for those two bars each chord entry will equal the time of an eighth note. For MIDI that will essentially give you what you want. For RealTracks you'll have to adjust the playback speed to half speed for the two bars.

For the end of the song, forget about using the programmed two bar ending because you can't really change that since the ending is embedded in the style. Instead extend the song length by four, six or even more bars. Program in the ending you want and fill out the rest of the chord sheet with rests.

Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home