[Dashboard] SCPI channels (@{var}) don't interpret variables correctly

[fietser28]

Describe the bug
When using a variable inside the channel specification of a SCPI command the variable is not interpreted.
E.g:

volt = meas:volt? (@{channel}01)

will not send ```mess:volt? (@201)` but the raw string. Studio doesn't generate an error on the SCPI syntax, but the BB3 of course does.

To Reproduce
See screenshot, the last SCPI command.

Expected behavior
A clear and concise description of what you expected to happen.

** Work around**
Use inst command, this works (but is not exactly the same because it changes the current instrument).

Screenshots

Desktop (please complete the following information):

• OS: Mac OS 14
• studio from GitHub (2 commits behind)

[mvladic]

Another workaround is:

volt = meas:volt? {"(@" + channel + "01)"}