There is a limited work-around to give you up to four lines of text display in kanban or gallery views that works well with roll-up fields; however, it does require either a manual step or Zapier integration to perform. In brief, you configure a roll-up field using
ARRAYJOIN() as an aggregation function and the Unix linefeed character (
\n) as separator. Then, you copy the column containing the roll-up field and paste it into a column containing a multi-line text field; when displayed as part of a kanban or gallery view, the first four lines (or, at least, the first XX characters of the first four lines) are displayed.
I’ve extracted the applicable pages from the Users Guide to my Wardrobe Manager base that describes how to set up the fields and perform the copy/paste. Again, it’s not a perfect solution, and it’s limited to four lines per field, but it might serve as a workaround for now.