MIUI is the most popular custom ROM out there. MIUI is popular for it elegant and sleek user interface. Trying something new is always exciting, though.
iOS provide the most beautiful font their devices. Trying iOS 9 fonts in any MIUI will be exciting.
You can install the font package any MIUI ROM no matter whether you are on MIUI 6 or MIUI 7.
Download Link: Get the font here
Here is some live images showing how it looks like on iOS fonts: