Welcome! You'll need to extract the number (or use a numerical field if you have the value in another field) and then perform the comparison to find those great than the value you need.
There's a couple of ways to do it depending on how you are ingesting your data (grok filter in logstash or processor in an ingest pipeline for example). If you don't have the value in a numerical field anywhere you could potentially use a runtime field to extract the value and then search with a gte operator on the value. This post should help you get started with a matcher example.
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