A recent commit in the Android Open Source Project Gerrit revealed that Google is working on adding hardware support for multi-SIM capabilities. One of the comments from a Googler suggests that the upcoming Pixel 4 will be packing support for eSIM and a physical SIM with dual standby.
https://www.notebookcheck.net/Google-Pixel-4-could-support-both-physical-SIM-and-eSIM.406221.0.html