I confirm that on Lucid (iBus with ibus-anthy), "cya" converts into "cや".
(Therefore, it is possible to write "ちゃ" by typing "cha".)
I confirm that on Lucid (iBus with ibus-anthy), "cya" converts into "cや".
(Therefore, it is possible to write "ちゃ" by typing "cha".)