In the footnote settings, how do you know what the prefix is ​​after the mapping font is changed?

In the footnote settings, how do you know what the prefix is ​​after the mapping font is changed?
I want to replace the BQ90 font with "A-OTF Ryumin Pro" above.
But after changing the font, I need to change the prefix. How do I know what the prefix BQ is to be replaced?

For example, I want to replace the "bq90" font below with "A-OTF-LYUMIN Pro".
What should "bq" replace?

the file is here