Limit products from adding to the cart from a specific collection

[unaizak955]

Hi, I am trying to set up a specific collection by restricting to add of more than one product to the cart but without any app.

Link for the collection page:

https://imarku.net/collections/flash-sale

Can anyone help me out with the code?

[j2021c]

Did you manage to solve this without app? If so, how did you do it?

Thanks,

Josh