You are quite right that any fraction with a sign of omission *does not* qualify as a simple numeric fraction (GTM 6.1, also the Bulletin article "Fractions: What are their symbols and rules?," in the 2020 Fall edition).
Really, the only correct way to transcribe the fractions you've highlighted is using the UEB general fraction indicators and line (GTM 6.4). ( ) and ./
Maaaybe, for this specific student only, you could use the general fraction line and not the general fraction indicators?? This would be a one-student-only accommodation.