Overview
This is an investigation record on how to customize LEAF Writer.
https://gitlab.com/calincs/cwrc/leaf-writer/leaf-writer
This time, it is a memo on how to add Entity Lookup. Specifically, we add functionality to query the Japan Search utilization schema, as shown below.

Method
The following changes were made to the forked repository.
https://gitlab.com/nakamura196/leaf-writer/-/commit/69e10e2ddd17f6cd01501fbf29f0dd86d1e86a3a
Usage
You can try a version with partially Japanese-localized UI using the following repository.
https://gitlab.com/nakamura196/leaf-writer
Please refer to the following for startup instructions.
Summary
By applying this method, it should be possible to add any arbitrary API.
We hope this serves as a useful reference for applying LEAF Writer.