Since Markdown (and so Obsidian) support HTML tags, a temporary solution to have bi-directional notes is to simply put rtl and ltr blocks between <div dir="rtl"></div> and <div dir="ltr"></div> tags.
<div dir="rtl">
این یک متن نمونه راست به چپ است
</div>
<div dir="ltr">
This is a sample left-to-right text
</div>
Then you can use the RTL support plugin shortcuts to change the direction in each block to write more conveniently. You can also use the Text Expander plugin to automate pasting div HTML tags