Is it possible to create a dynamic template substitution? (e.g. based on file name)

[PuppyGirlBelly]

I'm trying to create a daily note template that includes links to navigate between previous and following daily notes (e.g. "yesterday" and "tomorrow"). Which I prefer to avoid needing to rely on editor commands if I ever choose to migrate my notes again. I got a solution that works decently enough for the current day's daily note;

  -- Optional, for templates (see below).
  templates = {
    substitutions = {
      daily_nav = function()
        local title = vim.fn.expand "%:t:r"
        local date = parse_date_from_str(title) -- Custom function I wrote
        local yesterday = os.date("%Y-%m-%d", date - 24 * 60 * 60)
        local tomorrow = os.date("%Y-%m-%d", date + 24 * 60 * 60)
        local nav = "[[daily/%s.md| %s %s]]"
        local y_nav = string.format(nav, yesterday, "⬅️ ", yesterday)
        local t_nav = string.format(nav, tomorrow, tomorrow, " ➡️")
        return y_nav .. " | " t_nav
      end,
    },
  },

Which results in the following links for today (March 20th);

[[daily/2025-03-19.md| ⬅️  2025-03-19]] | [[daily/2025-03-21.md| 2025-03-21  ➡️]]

# 📅 Thursday March 20, 2025

However, if I make a new note for a date different from todays (e.g. :ObsidianToday +3); it will only populate with the the current's day's "yesterday" and "tomorrow".

[[daily/2025-03-19.md| ⬅️  2025-03-19]] | [[daily/2025-03-21.md| 2025-03-21  ➡️]]

# 📅 Sunday March 23, 2025

I can see why this happens, the command to create a daily note does not open it in a buffer as it's being created. Which results in the vim.fn.expand "%:t:r" to query the currently opened buffer.

I'm wondering if there's a way to query variables about the newly created file as it's template is being processed (e.g. the file's title)? Since that would help me achieve my goal.