Dbc.popover on DataTable column header?

Dash Python
1

Can a DataTable column header have a dbc.Popover
The column header can have a tooltip but that is not enough for my needs. I want to enter data into the popup ‘tooltip’-equivalent

2

I used to be able to add dbc.Popover to a DataTable column but now it stopped working.
Has the DataTable column-identifier changed?

dbc.Popover(
                                        content,
                                        target=self.id+' th.dash-header.column-{}'.format(col_nr),
                                        trigger='hover',
                                        placement='right',
                                        delay={'show':300,'hide':50}
                                    )