i am close with an intj female, and your description has helped me understand her. Fi is like an inner child (for her it sounds like ted leo songs). our connection is that she hides it underneath objectivist hierarchically prioritized Te organizing her Ni big picture (which is where we connect). and that i absolutely refuse to let her inner child not come out and play. that even tho the Ni + Te gives her this cutting, absurdist, mirthful humor, w/ me she secretly wants to play and embrace the sentimental and gooey Fi.
and yes, we get there bc her NiTe knows. with Ni dom her internal environment is instantly recognizable and almost transparent to me, we just organize them with different principles (Te vs Ti). although she does not fully understand the glossy colors and hues and shades of feeling-tones that my Ni is painted with, composed of, etc.