Where to add CSS data attributes in Perspective projects

Ignition
,
15

idk if this will suffice for your usecase, you'll need some lines for each possible header

.psc-tooltipClass:before{
    content: "Basic tooltip";
}
body:has(.ia_table__head__header__cell[data-column-id="city"]:hover) .psc-tooltipClass:before{
    content: "City";
}
body:has(.ia_table__head__header__cell[data-column-id="country"]:hover) .psc-tooltipClass:before{
    content: "country";
}

(note the style class and there has to be a text which will always display, though i guess you can use css to make it invisible)
image
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image

if thats not enough you'll have to use some markdown js injection