by converting object parameter to JSONTemplate in the below commit https://github.com/unlayer/angular-email-editor/commit/00531566ab2c1321f2d0153df030def4fbc5feac#diff-799ddc34b2296767ac7f9fa14bae6050609a104930ded4de787dfdb7f49e50cbL97 the angular port of unlayer cannot use the legacy template loading as described in the official docs https://docs.unlayer.com/docs/legacy-templates https://examples.unlayer.com/web/legacy-template/