Insert/ Append/ Prepend a string to a File with a specific Name (at a specific Line)

[Excali6ur]

Scouring the web I found a way to prepend to the current File using replaceRange
<%* window.app.workspace.activeLeaf.view.editor.replaceRange("---\n\n---\n", { line: 0, ch: 0 }, { line: 0, ch: 0 }) %>
suggested by @liamcain

But is there a way to either insert a string in a File with a Specific Name at a specific line, or append to the end of that File?

[AB1908]

You can find the file to append to with tp.file.find_tfile() and then actually append to it with await app.vault.append(TFile, "string contents").