Is it possible to set my apple watch to theatre (cinema) mode at a given time of day, using the Shortcuts app?

Thank you - that's very helpful; the big thing I was missing was the 'Automation (Bottom Center) step!

One note - the interface has changed slightly, there's no plus sign at top right; for others following me, the process I had to follow was:

Shortcuts App

Automation (bottom centre)

New Automation (centre of screen)

Time of Day

Set Time

Daily

Run Immediately

Do -> Choose -> New Blank Automation

Add Action -> Search for 'cinema' (why it says Cinema in Shortcuts and Theatre on my watch I don't know ..)

Select 'Set Cinema mode'

Leave set to default ('on')

Done

FYI - first time I did this, it said 'No Action' when I was done, so I had to go back in and repeat setting Cinema mode, but it 'caught' the second try - thanks again!