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Extensions: Support Development in Local Workbench #691
Today, application extensions in SPFx (command sets, application customizers & field customizers) can't be tested within either the local or SharePoint Online hosted workbench. This is a bummer and a big step backwards to such a cool aspect to the development story with SPFx.
I get that you need a list to work with, but at a minimum, the workbench could have a static list with static data and no other functionality for us to test the customizations on.
My wish is that Microsoft adds support to the workbench for extensions before GA.
OK, cross-referenced: Extensions: Support Development in Local Workbench
Have you checked Ignite video Building the modern SharePoint experience: Best practices from Microsoft for developing with SPFx ? It actually mentioned about an approach which you can add your SPO workbench with your customization properties into serve.josn, and then you can call gulp serve --config [your config] to open up your browser and go that url directly. You probably can find out the detail around 00:35:00 in the video. the following is a sample of serve.json:
you can run the following command