Missing variables for some elements

Im customizing redoc via theme and found that some elements dont use variables, but they need to

https://github.com/Redocly/redoc/blob/main/src/common-elements/fields-layout.ts#L208

https://github.com/Redocly/redoc/blob/main/src/common-elements/headers.ts#L47