Kirby 3.5 Layout-Field in Builder Element

Hey, welcome to the forum.

The builder plugin is not compatible with Kirby 3.5, so no.

Kirby 3.5’s blocks/layout field is intended to replace the builder plugin, to finally have it in the core. The Builder plugin will no longer see any development. You can still continue to use it in Kirby versions prior to 3.5, though.