Is there a solution to monitor and extract LinkedIn comments based on keywords and hashtags?

I'm studying for a PhD in AI and I am looking for a solution that can extract comments from LinkedIn posts based on keywords or hashtags used. I've looked at BrowseAI which I thought would help but when I contacted them, they didn't seem too confident. I've also seen DataMiner and LinkedIn Comment Exporter, which are good but I need to find the posts first. Any suggestions welcome. Maybe I have to use two tools, one for monitoring and one for extraction which would be fine or do the monitoring myself which does add some credibility to the quality aspect of the research. Thanks if you are able to help. Darren