plotmath: angle brackets

Dear all,

is it possible to print angle brackets (LaTeX notation: \langle, \rangle)? I found that lceil and lfloor
are available, see demo(plotmath). But langle and rangle are not.

I tried to print utf8 characters directly?as?well without success.

I have also read something about a tikzDevice package. But obviously this is not available anymore.

Any suggestions?

Greetings
Donatella