VAADIN 8 - how to incorporate external elements made with react,angular, j

Hi, we are using vaadin 8, but the rich text editor available on vaadin is not full of features, like (tables, copy/paste images from clipboard, etc) as well we need a calendar but the lack of it, we are using calendar from version 7 in compatibility mode.
Can anybody help me how to incorporate other richtext editor, calendar or others elements externally made.

regards,

Luis Hernández