How to develop Kibana custom plugin to add a custom agg type in Kibana Platform?

Elastic Stack Kibana
1

I want to update Kibana from v6.8.23 to v7.17.8, but the plugin kibana-datasweet-formula that I want to migrate to Kibana Platform do not work (Installation failed).

I found this place to register each agg type:

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but I have no idea how to register my custom agg type.

Besides, the args type of agg type function is limited, see below:

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How to add a new METRIC_TYPES without modifying the source code?

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