"the demand on" is a perfectly acceptable and usable phrase in written English.
An example sentence might be: "The demand on our resources has increased greatly since the pandemic began."
The demand on her surgeries is large and growing.
The demand on our public services is considerable.
As the heat eased on Thursday, so did the demand on the power system.
Educated citizens also make better health and retirement choices, further reducing the demand on public resources.
The demand on our team felt incredibly high and our management team was clearly very strained.
Bayer condemned the action, saying it could meet the demand on its own.
They also reduce the demand on GPs, hospitals and rehabilitation services".
Mr Trump made the demand on Twitter writing: "Has Saudi Arabia, taken any of the Syrian refugees?
As people are living longer and the population is aging, the demand on the health care system will be huge.
Resolution 1441 20022) was adopted on Nov. 8 last year and emphatically reaffirmed the demand on Iraq to cooperate.
He writes, "Well, that's true", and, "the demand on them to, well, demand", and so on, repeatedly.
