Underlined text not supported

[iuzn]

Since an underlined text doesn't have a tag in Notion, there is no tag on the API side.
Notion uses border instead of tags.
For this reason, Notion renderer cannot manipulate underlined texts.
How can we find a solution to this?
Is it necessary to make an improvement on the API worker side?

Notion page:

Output:

API worker:

[iuzn]

@transitive-bullshit I know, it's a good job. I will try this for another version of my project, until I code my own package.