PHP-CS-Fixer multiline variable definition

Is there a PHP-CS-Fixer rule which aligns multiline variable definition after the equal sign?

For example, we have this input:

$example = $this->is()->aLong()->definition()->so()->we()->want->()->multilines() +
    $this->is()->thesecondline() +
    $this->is()->thethirdline() +

Output should be:

$example = $this->is()->aLong()->definition()->so()->we()->want->()->multilines() +
           $this->is()->thesecondline() +
           $this->is()->thethirdline() +

I'm not sure if there are PSR standards for variable definition or other best-practices how to style this sort of code. In my eyes, it looks way cleaner if it is aligned. I tried to use binary_operator_spaces but it didn't work so far.

Any ideas? Many thanks!