What problem does this feature solve?

ECharts' time series label formatter can show dates like "1 October 2023" using {d} {MMM} {yyyy} . But it cannot show "1st October 2023" with the "st" after the "1". It needs a new template to do this.

I suggest adding a template that will produce Day of Month with ordinal indicators such as 1st, 2nd, 3rd, 4th, 5th, etc.

What does the proposed API look like?

I propose adding a new template {Do} which stands for "day with ordinal" and produces days of the month with the correct ordinal indicator (st, nd, rd, th) such as 1st, 2nd, 3rd, 4th, 5th, etc.