I’ve created circled figures 51–99 (single glyphs) and applied PUA Unicode values E051–E099 but they won’t show in the InDesign glyphs panel search feature – they are visible but not searchable.
When hovering over the glyph in the panel it shows the PUA name etc, whereas circled 50 shows CIRCLED NUMBER FIFTY which is preferable
The text in the tooltip comes from the Unicode data, not from the font. I don’t think you can do something about this.
And it might be bette to build the numbers with openType. As ligatures from the single digit cycled numbers.