I have the exact same problem and really would need this feature.
In my case if i only make a part of the word bold (e.g. twój, twoja), and I search for twoja or twój, it won’t be found.
This is really a disadvantage, therefore I second this FR.
This applies to Cmd + F single file search as well, although Cmd + F can be used in reading view which in turn matches rendered content and ignores 100% inline formatting.
This limitation discourages searching for exact matches, since formatted text won’t be found.
I wonder if it’s possible to implement some sort of workaround solution for this that utilizes regex. Maybe a plugin or a Templater script that asks a user for input, wraps each word in regex syntax that accounts for all possible markdown formatting syntax, and inserts it into the search.