Is it possible to add a template.ss file via php, like a requirement::javascript?

SS4.4
Is it possible to add a template.ss file via php, like requirement::javascript i.e?
I wrote a module that needs to add some markup to page.ss.
How can I do that without changing Page.ss or anything else which is not included into the module-stack.

Do you need to specifically add something to Page.ss, or to the page which gets rendered?

If it’s the latter, you could just use a middleware… that will give you access to the complete output from the site, and you can manipulate it as you see fit:

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I have exteneded Varchar before and added functions there / changed them.

Then in templates you can write:

$Email.Hidden or $MyPercentage.Nice

Also - you could consider: just adding the HTML via Javascript using Requirements.