Simple multiplication of a variable in JSON

Hi and sorry for the super-n00b question.
Im trying to multiply a stored number ${Hours} by 60 to get ${HoursToMinutes}
I’ve confirmed by ${Hours} has number data, but UI.Vision does not like my syntax. Love some advice (and yeah, I tried GPT4- no help lol) Here is my code
“Command”: “executeScript_Sandbox”,
“Target”: “let inputHours = Number(‘${Hours}’); let HoursToMinutes = inputHours * 60; return HoursToMinutes;”,
“Value”: “HoursToMinutes”,
“Description”: “”
“Command”: “echo”,
“Target”: “${HoursToMinutes}”,
“Value”: “”,
“Description”: “”
I get an “unexplected token” error on the sandbox command