Texts from Aozora Bunko have sometimes the reading of kanjis indicated with small kanas above the kanjis (furigana). You can have the same with your own text by using following symbols :
The furiganas will extend until a kana or the ｜symbol is found.
You will have also to change the settings of your text file (library - edit and turn the switch "aozora format" on).
"｜" is unicode 0xFF5C.
"《" is unicode 0x300A.
"》" is unicode 0x300B.