"highly relevant topic" is a correct and usable phrase in written English.
You can use it whenever you want to emphasize that a specific topic is important and closely related to the subject at hand. Example: "In today's rapidly changing world, climate change is a highly relevant topic that cannot be ignored. Its impact on the environment, economy, and society is significant and requires urgent attention."
The World Yearbook of Education 2019 explores this highly relevant topic, opening a new discussion about the various conceptual and methodological challenges and opportunities in contemporary educational research.
Dave Eggers' novel is a sort of warning blast against the power of giant tech companies – still a highly relevant topic – and this adaptation directed by James Ponsoldt has an appropriately heavyweight cast: Tom Hanks as one of the outfit's leaders, Emma Watson as the lowly employee rising up the corporate ladder, and John Boyega as the mysterious Kalden.
The issue is a highly relevant topic in the context of recent development of cellular systems.
When your hiring manager answers the wish-list question, it will probably be the first time they've considered that highly relevant topic.
The crosstalk between phosphorylation and ubiquitinylation is a highly relevant topic in contemporary biomedical research.
A highly relevant topic in biomedicine concerns the conditions of genotoxic stress that damages the genetic integrity of human cells.
In this special Methods collection on DNA helicases, I have solicited articles from leading experts in the field with a priority to gather a defined series of papers on highly relevant topics that encompass biological, biochemical, and biophysical aspects of helicase function.
For instance, the direct effect of perception on action, and action on perception (which lead to phenomena like priming, alignment and mimicry) are highly relevant topics in social cognitive science and should be considered as requirements for modeling social interaction.
Given the complexity and multidisciplinary nature of tropical medicine and global health topics, we are now welcoming highly relevant topical reviews focused on topics of high current interest to the Journal readership.
Exploration of advanced anode materials is a highly relevant research topic for next generation lithium-ion batteries.
Cloud computing environments tend to make use of both machine and network virtualization, making this a highly relevant related topic for our study.
