You need to create as mentioned already in the old thread, you need to use Custom Roles, here are some links to help you :
Restricting read and run access to Azure Data Factory individual pipeline
Hello,
Our data team support multiple research teams. We create ADF pipelines for researchers under one resource group (because it all falls under one research purpose). Since researchers aren't well-versed with Azure, we want to make sure they don't accidentally modify pipelines created for others. To do that, we need to tailor read and run permissions to each researcher (or each group of researchers) in ADF for specific pipelines.
When I searched, the closest post I found was this: https://learn.microsoft.com/en-us/answers/questions/1047941/restricting-read-access-to-pipeline-in-adf
It seems like there was no such solution in granting access to specific pipeline in ADF. I wonder if it is still the case. I am hoping there is support for this (granting a group of users access to specific ADF pipelines) in ADF now. Thank you in advance for your answers!