Jewish graves when not Jewish

[SchoolMoney]

I apologise in advance if I am offensive in my ignorance asking this, I really do not want to be but Google didn't help and I have no one to ask irl.
I understand the reason for stones on Jewish graves rather than flowers(as I am used to). However, is it offensive/in bad taste for a non Jewish person to place ones there?
The reason I ask is because there is a small Jewish cemetery near me and I have seen on another online forum related to the town someone who is saying they have a relative there. They can't visit or pay their respects and no one else who knows their relative is nearby. I would like to pay my respects to this wonderful sounding person, and also in a way for their family who can't do so.
However I am very conscious of it might be wrong or accidently causing offence.

Would it be wrong for a non Jewish person to place a stone on the grave/enter the cemetery/is there some I way I can?

Again I apologise if I seem stupid or ignorance for asking, thanks for reading.

Sorry, I have no idea, but what a lovely thing to want to do. I hope somebody comes along soon who can advise you

I'm not sure but following. I did this when abroad because my Grandad (not Jewish) was in a concentration camp and there was a monument to it. It didn't occur to me it might be offensive so I hope not.

No - Who could possibly be offended by this?

Of course you can visit, if you have the details of the cemetery you can ring them, there will be a number for enquiries, and ask for visiting times, you may also want to know where the actual grave is.