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VaultChatFormatter
This plugin formats the chat, using one template format, and has placeholders for a player's prefix/suffix which can be used in the template.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Hex codes were added in 1.16. Most chat for matters support them. You can use the search term “Chat formatter” when looking for a plugin. I like a specific fork of VaultChatFormatter, though it doesn’t have too many features. A good choice if you’re using essentials would be EssentialsChat. There are some other pretty nice chat formatting plugins online that I don’t know off the top of my head.