How to validate the mj-all attribute?

[kishanindegene]

<mjml> <mj-head> <mj-attributes> <mj-all colcccccor="#000000" font-family="Arial"></mj-all> </mj-attributes> </mj-head> </mjml>

[iRyusa]

For now there's no way to do so, it would require to merge every type attributes into an object and deal with different types.