Custom(JS) formatter for hover tooltip?

I read that I can do datetime formatter and printf and numerical, but what if none of these fits my need? I do not see this covered in the docs

Take a look at https://docs.bokeh.org/en/latest/docs/user_guide/tools.html#formatting-tooltip-fields, especially the last sentence of the section.

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Ah! it was a bit hidden by the plot just above it. Reading that!
Thanks

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