Can point size of ruby texts using oopinyin be set bigger?

Oopinyinguide works very well putting ruby texts above/below Chinese characters using LibreOffice under MS Window 10, except that the point size of the pinyin is too small for us. When we highlighted some characters and selected a larger point size, the characters got enlarged but the size of the rubies remained as before. Choosing other character style does provide bigger pinyin texts, but they don’t look as good. Is there a way to enlarge the pinyin texts when we choose ‘Rubies’ as the character style?