It’s been few years since we had this request. It looks like there is no scope for it. I made a simple plugin with some popular devices and their screens sizes. You can make use of it till Figma plans to fix this.

https://www.figma.com/community/plugin/1395497684072379171/quick-frames

Its pretty basic with just a list of frames. Try it out and share your feedback in the comments and I’ll try to get it done.

Would love being able to create my own device frames. The current solution of doing it manually is extremely cumbersome.

Whenever we work in non-standard types of devices it’s very important to remind the users and set the context that, even if they’re interacting through their computers, that UI is supposed to run somewhere else where mental models, needs and desires might differ substantially.