Setting header impossible for the expandIcon-s column

[gitact]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

(https://codesandbox.io/s/l2rdq)

Steps to reproduce

open link above (or see on the official documentation [https://ant.design/components/table/#components-table-demo-expand] ). And note that first special "[ ] column" hasn't any header.

What is expected?

When designing an "AntD Table expandable" following API on [https://ant.design/components/table/#components-table-demo-expand]
i get a PLUS [ ] icon-button drawn beside the row i want to expand the details for (following the API props like expandable={{expandedRowRender: .... }}
The icon-buttons are put in an autonomous column: i would like customize the column with an explicative ad-hoc Header!

What is actually happening?

AntD doesn't provide APIs for customizing the column with an explicative ad-hoc Header (like EXPAND FOR DETAILS)

A terrible (and graphic) solution could be seen with a Header DETAILS on
https://codesandbox.io/s/sleepy-hermann-up8qf?file=/index.css:0-83
with an ad-hoc CSS, lacking of elegance and scalability and dangerously connected to the current inner architecture...but you can see the graphic result and test better solutions thanks to CodeSandBox.

Environment Info
antd 4.3.4
React 16.13.1a
System windows 10
Browser chrome 83

What does the proposed API look like?

AntD doesn't provide APIs for customizing the column with an explicative ad-hoc Header (like EXPAND FOR DETAILS)

Similarly to
expandIcon Customize row expand Icon. Ref example Function(props):ReactNode -
and coherent to naming like expandIconColumnIndex, I would propose

expandIconColumnHeader	Customize expand Icons column header.	Function(props):ReactNode

See also https://codesandbox.io/s/sleepy-hermann-up8qf?file=/index.css:0-83

[Cpt76]

I fully agree with the proposal.

[angelo24782]

I searched for the same problem,
cause i wanted to open an issue about it UP for it
Very annoying also for my project. it's a kinda BUG !

[pleshevskiy]

The same problem

[gitact]

Any news about from ANT DESIGN TEAM?
@AntDesigners @ant-design-bot
We feel very forgotten :-(

[fangyuan-airwallex]

Agree with the proposal +1

Also it is possible to customize expanded inner table style, e.g. I don't want inner table indentation and I need overwrite style by myself

.ant-table-tbody > tr > td > .ant-table-wrapper:only-child .ant-table {
    margin: -16px -16px -16px 33px;
}