How to change text formating in a cell?

Hallo!!

I am working on a dictionary and I want to change the formating of the text of column B by setting prerequisites.

Example:
"Απαλλοτρίωση, εκποίηση, παραφροσύνη (ιατρ.)
Abalienation as a process to eminent domain = Διαδικασία αναγκαστικής απαλλοτρίωσης
Abalienation of encumbered property = Εκποίηση περιουσίας μετά βαρών"


I want that everytime the cell includes the symbol = , that the text that follows it will be plain and not bold. Lines are seperated with 'alt return'

Is it possible to create such a rule?

many thanks!