How do I specify baseUrl for the hrefs generated in xrefmap?

Is there a way to specify the `baseUrl` to be used when generating the `xrefmap.yml` file?

So that it generates

` href: http://[baseurl]/api/[ProjectName]/[UniqueId].html`

instead of

` href: api/[ProjectName]/[UniqueId].html`

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Or else, it would be also helpful if it was possible to simply define the `baseUrl` in the `docfx.json`

"xref": [
{
"fileName": "xrefmap/xrefmap.yml",
"baseUrl": "http://baseurl/"
}
]

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The reason behind this is that, I don't want to manually modify the `xrefmap.yml` file generated by another project.