How to write JPA specification for postgres text[] array

Question

 @Column(columnDefinition = "text[]")
 @org.hibernate.annotations.Type(value = CustomStringSetType.class)
 private Set<String> touchedBy;

How to write a JPA specification for this touchedBy?

In database I have

"{idcn8,idcn6,idcn7,idcn4,idcn5}"
"{idcn2,idcn1}"
"{idc1,idc2}"
"{idc4}"

I want to pass values like idcn1, idcn5 to the JPA specification and filter the rows. Could anyone help me how to achieve this?`

I am not sure how to write specifications to filter array values. Could someone help me with how to write?