How can we insert an en-space between note identifier and text?

Currently I use SBL formatting guides for my papers. Problem is, it requires that there be an en-space (5pts if using 10pt font in footnotes) between the footnote character and the text. And I can’t for the life of me find out how to do that in LibreOffice.

Currently, my less-than-exact “hack” is to go to Tools → Footnote → type 3 spaces in the “After”, so it inserts 3 spaces for me automatically (I’m using 3 spaces as my Footnote Character under F11 Styles and Formatting is superscripted, so while 2 spaces would be close to an en-space (one space is usually an i-space or half an en-space), 3 superscripted spacebar/vanilla spaces approximates an en-space.

I know another way that gets me exactly one en-space in my footnotes between my footnote character and my footnote text is by going to Footnote character (under F11/Styles and Formatting → Character) → and then going to spacing → expanded by 5 pts. Problem is, once you get into the double digits, footnote 14 has an en-space between the “1” and the “4”. Yes, I am anal about spacing. But I wish there were a way to do so exactly instead of using three spacebar spaces (superscripted).

Similar question as asked (and answered) here.

You can set the indent “Before text” of the footnote paragraph style to zero, the indent “First line” to one-half inch, and to get the space between footnote number and footnote text you insert the needed en-space manually as first character of the footnote text. This way it will work the same for footnote numbers 10 and higher as for smaller ones.