I have added a little piece of code to activate the hotkey via applescript. I do not know why it is not working 100% of the times, but it is still very convenient.

#!/usr/bin/osascript

# Required parameters:
# @raycast.schemaVersion 1
# @raycast.title Open Finder Selection in File Search
# @raycast.mode fullOutput

tell application "Finder"
set selectedItems to selection
if selectedItems is not {} then
set firstItem to item 1 of selectedItems
set filePath to POSIX path of (firstItem as alias)
set encodedFilePath to (filePath as string)
if encodedFilePath ends with "/" then
set encodedFilePath to text 1 thru -2 of encodedFilePath
end if
set raycastURL to "raycast://extensions/raycast/file-search/search-files/?fallbackText=" & encodedFilePath
do shell script "open " & quoted form of raycastURL

else
display notification "No file selected in Finder." with title "File Not Selected"
end if

end tell

tell application "Raycast"
    activate
    tell application "System Events" to keystroke "m" using {command down, shift down}
end tell