cant register custom template functions

[ovnicraft]

Describe the bug

Reading docs: https://goadmin.dev/templates.html#custom-functions

funcMap := template.FuncMap{
    "upper": strings.ToUpper,
}

renderer := adminpanel.NewDefaultTemplateRenderer()
renderer.RegisterFuncMap(funcMap)

but panel has no RegisterFuncMap() func, i could not find it in src, is it already published?

search in repo:

https://github.com/search?q=repo%3Ago-advanced-admin%2Fadmin%20RegisterFuncMap&type=code

Expected behavior

Add custom template funcs.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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