'we must highlight' is a correct and usable phrase in written English.
You can typically use it when you want to emphasize something important. For example, "We must highlight the importance of using face masks during this pandemic."
We must highlight colleges' role in supporting community cohesion and I have been particularly pleased to support the commission for black staff in FE.
We must highlight that the uniqueness of the fixed point was not proved in such result (it was studied in Theorem 2.2 in [12]).
Reflecting on the realizations achieved through the Mobility Partnership, we must highlight the role it has played in placing the issue of migration onto the national political agendas of the countries of the Eastern Neighbourhood.
We must highlight the liberation and the return to constitutional order in Mali, and we can rejoice but must remain vigilant.
And, most importantly, we must highlight and celebrate women scientists who could be emulated by young girls and who could send the message that girls and boys are equals.
When there is a moment in the school day when a student demonstrates empathy or kindness to another student, we must highlight it, and bring it to our students' attention.
They must highlight their humility; that they don't know best and they must challenge the pressures to bureaucratise them.
It is clear that public bodies must highlight the major public policy issues which arise from this case.
Rio+20 must highlight the essential role of the private sector in sustainable development, as investors, employers, customers, and producers.
Rodriguez has spoken fondly of Boston, of the passion of the Red Sox fans, and his years in Texas must highlight what he has been missing.
You must highlight the diverse expertise of your team while conveying commitment to a common goal.
