Reference line for nominal values

Hi all,
I would like to add two traces - one of type 'box' and the other of type 'line'.
Line width is controlled whenever I plot numerical values - simply using the min/ max values to select my lint starting/ ending point.
However, I'm trying to get my line start/ end according to the nominal value I have (e.g., 'T1') so I cannot use x0 and x1 as numerical values.
When trying to set: x0: 'T1' and x1: 'T1' I get a dot and not a line.
Is there a way to set the start/ end point according to the box plot width?
Following an image of what I'd like to achieve - a box plot with two reference lines/ limit lines:

首先，在 angular-plotly.js 中使用名義值 'T1' 重現回報的箱型圖和線條軌跡，包括所附範例中的參考線。找出相關的繪圖進入點或文件，然後確認線條端點是否能夠跟隨箱型圖寬度，並記錄受支援的行為或所需的變更。