pango-like markup in tab title template?

[chipaca]

Is your feature request related to a problem? Please describe.

Currently my tab_title_template has the very hacky (avert your eyes!),

tab_title_template "{fmt.nobold}{'¹²³⁴⁵⁶⁷⁸⁹'[index-1]}{fmt.bold}{title}"

(this relies on how kitty falls back to the default {title} when the custom one throws an error)
This is particularly useful for me because I've bound alt+1 through alt+9 to the first 9 tabs (and alt+0 to the last)

Describe the solution you'd like

It would be nice to be able to have some kind of markup in there (thinking pango markup, but that would be a rather big new dependency).

Describe alternatives you've considered

My current approach is probably fine.

Additional context
123 all the things

[kovidgoyal]

Not sure I follow, what would pango markup get you that the current markup doesnt? You can set bold/italics/fg/bg colors with the current markup. And that is all the formatting the underlying implementation supports. There are no super/sub scripts in terminal text. If you want that it should be a fairly trivial patch in the current code, without needing a new markup language for it, essentially just map a-z0-9 to the unicode super/sub symbols

[chipaca]

I'd use it mostly for size control and positioning (but superscript would be enough), but it would also let you change fonts and that sort of thing. I was trying to generalize from my problem (hacky superscripts) to something more people might find useful :-)

[kovidgoyal]

The tab bar is rendered by an actual terminal, it supports only the formatting terminals support, nothing else.

[chipaca]

oooh, does ssupm work in kitty?
edit: nope. supcs is empty.

[kovidgoyal]

nope there is no support for superscript/subscript mode in kitty.

[chipaca]

aw well. I can see doing it well would be a pain from the width of rendered text pov.

Thank you.

[chipaca]

thank you!