Let html tag in markdown be foldable

[SHF101202021]

Proposal

While writing massive texts, folding is a very good function to be focus the current content.
For example, long programming texts in the article (Please look at the line 8).

However, when I want to fold some html tags like <details>, it fail (Please look at the line 4).

Basically, it just fold elements which are sequentially arranged.
Hence, I want to request to make VScode consider html tags when folding.