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Here's a nixos-rebuild wrapper script that formats and colorizes traces
Here it is https://codeberg.org/gmg/concoctions/src/branch/main/sh-scripts/nixos-rebuild

(if you try it and find any bugs, please let me know)
edit: I didn't realize the screenshot shows just instead of nixos-rebuild... that runs a script ("recipe") that calls nixos-rebuild so the output shown is from the (wrapped) nixos-rebuild
May I ask what your full nixos-rebuild command is?
That just build t8plus becomes nixos-rebuild build --option eval-cache false --flake './nixcfg#t8plus' (the flake is at ./nixcfg/flake.nix).