Is there a way to add supported UI component?

Hi,
Adding support for new components is quite easy,

You just need to create a class that inherits from LocalizeTarget and implement the corresponding methods.
Most of the time the implementation is quite similar to other existing components, so it will be almost a copy/paste from one of the other targets in the plugin.

For example: LocalizeTarget_UnityStandard_TextMesh or LocalizeTarget_UnityUI_Text

Hope that helps,
Frank