Feature request: Give user ability to provide a patcher pattern

[arths31]

Hello,

I am wondering if it would be possible to add a property in PatchDocumentOptions so the user could define the pattern used to patch.

For example instead of using {{ }} we could use { } or [ ].

I see that at the moment the pattern is hardcoded in from-docx.ts line 138.
const patchText = {{${patchKey}}};

Tell me your thoughts
Thanks

[arths31]

Here is a quick and dirty example : arths31@64961d8