How to implement customized dialog field for aem 6.5

[KushalShahi]

Environment

Bobcat version: 2.3.0

Bobcat modules used:
bb-core
bb-junit5
bb-aem-core
bb-aem-65

Browser + version: Chrome 81

Expected Behavior: Values provided for dialog fields in YAML file should get written in respective fields

Actual Behavior: Provided values in YAML file for Components Diaglog fields (RICHTEXT, CHECHBOX etc.) are not getting written/updated

We have customised all the OOTB dialog fields of aem6.5 and so the provided OOTB component configuration is not working for us.
Would request to help us find a way to write custom code for dialog fields of components.
We tried steps provided in below link but it throws null pointer exception as fields are not getting available in bobcat framework to be used.
https://github.com/Cognifide/bobcat/wiki/Component-configurer