Update: I have finally got ℤ to be displayed by my Clara HD. I copied the font 'NotoSerif-VariableFont_wdth,wght.ttf' to the Clara's fonts folder, then selected the 'face font' in the epub settings to be 'Noto Serif'.
One correction to my earler post. Gnome Char Map should have selected 'View > Show only glyphs from this font'. Then the TimesNewRoman font would NOT have been shown as containing the ℤ glyph; and the NotoSerif font would have.
Thanks to everyone for helping.
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