To understand the "portable" aspect, we must first break down the nomenclature.
The term "portable" in your text likely refers to a of the font file (such as a standalone .ttf or .ttc file) that can be carried on a USB drive and used on different computers without needing a full system installation, or it may refer to a "portable" document format where the font is embedded so the Pinyin remains visible on other devices. Where to Find or Use It fzktpy01 font portable