Implement API support for wp-toolkit
For example, the task is to retrieve a list of all plugins and themes (including versions) of all existing wp instances via php. A similar retrieval is done by wp-toolkit.
Locally, it is possible to use CLI:
plesk ext wp-toolkit --help
However, when there are several servers, it is helpful to be able accessing this information remotely. Currently, there is no possibility to do it using either the rest-api nor the xml-api.

Use Plesk REST API. With REST API you can call CLI utilities with necessary parameters. Here are some examples – https://support.plesk.com/hc/en-us/articles/115004331094-How-to-manage-Plesk-via-REST-API-and REST API documentation – https://docs.plesk.com/en-US/onyx/api-rpc/79359/
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IG
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Reinier Post, TU Eindhoven commented
We only have reseller permissions, so we cannot use any command-line tools. Does this also work for us? (Currently, we have permission to use the XML API, not the REST API, but I could request that.)