[Data Grid Reactive] Is there a guide on how can I implement custom editor?

The screen is an editable grid where the options in the first column should be the leaf nodes in a tree model. The requirement is for the user to be able to select the leaf nodes presented in a tree view. Upon selection, the value should be the path to the node.

The following screenshot is a dropdown column. The requirement is to improve the listing and display on selection of the leaf nodes.

I've already checked the following link but it does not provide steps on how to implement a custom editor from scratch:


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