I noticed there is no jsdoc support in typescript-ts-mode, and I would love to add a patch/PR to add it! I already have a working solution: I found who that same support is implemented in js-ts-mode and slightly modified it to work with typescript-ts-mode. Currently I apply that extra config in my init.el, but I imagine it relatively straightforward from here to contribute it to typescript-ts-mode.el itself.
More info can be found here on reddit where I asked for help, got it, and then I edited the answer to contain the full solution:
https://www.reddit.com/r/emacs/comments/1kfblch/need_help_with_adding_jsdoc_highlighting_to/ .
I would appreciate any direction on how to go about this: I have been programming for 20 years but I never used a mailing list and am not sure what is the etiquette / right way to handle this!