The kind of modelling we do does provide information about emission pathways that would lead to certain temperature consequences and other changes in climate.
The pathways that were used in the last IPCC assessment, which was published in 2014, did have a low-emission pathway that did limit warming to between 1.5°C and 2°C. The emission pathways that were associated with that are contained in that report.
This special report, the new one, provided even more information, more details about the contributions to those emissions and the more detailed pathways that would lead to 1.5°C and 2°C and also talked more about the difference in impacts that would be associated with limiting warming to 1.5°C versus letting warming go to 2°C or exceeding that.