I don’t have a Librem 5, but I think the squeekboard equivalent is pretty basic version and not particularly usable. Here was an old open issue for squeekboard ( Swipe input (#52) · Issues · World / Phosh / squeekboard · GitLab ) with a relevant merge by Guido ( Allow to swipe over characters (!77) · Merge requests · World / Phosh / Stevia · GitLab ).
Note that links to a video by Guido posted to librem.one Guido Günther: "Ever since doing the initial completion support i…" - Librem Social