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I would use an export filter, probably the table-cell one. For the case above, here's a possible filter implementation:
(defun ndk/html-filter-table-cell-bullets(text backend info)
(when (org-export-derived-backend-p backend 'html)
(replace-regexp-in-string " - " "<br/>- " text)))
(add-to-list 'org-export-filter-table-cell-...
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