Is it possible to use multiline todo's in IntelliJ IDEA?

This is supported since 2018.3.

Multiline TODO comments

IntelliJ IDEA 2018.3 now supports multiline TODO comments, now the first and all subsequent TODO comment lines are highlighted in the editor and listed in the TODO Tool Window. Simply add an indent starting from the second line of your multiline TODO comment, and the IDE will differentiate it from an ordinary comment.

No, not for now.

This feature has been discussed, but not yet implemented.

EDIT/UPDATE:

It is implemented in 2018.3 version.

In my settings I'm using such a regex for multiline TODO:

\/(\/|\*)[ ]*\btodo\b(.|\n)*(\*\/|)

The only problem is that it doesn't highlight last */ symbols of multiline comment. If anyone can solve that, it would be great!