There are tons of risk of bias tools for authors can use. Cochrane, Robin-1, OHAT, SYRCLE, Just to name a few. I saw some systematic review self-made their own risk of bias and also some systematic review modified their tools to better assess journal that they reviewed. Is that proper? Is there a source that discuss good way to made or modified risk of bias tools?
Article Tools for assessing risk of reporting biases in studies and ...
https://methods.cochrane.org/bias/risk-bias-toolhttps://ntp.niehs.nih.gov/whatwestudy/assessments/noncancer/riskbias/index.html
There are many resources for this. The above may be helpful. Good luck.
Ramadhani Hengki Wijaya I think we should use validated assessment tools rather than creating new tools. Jonna Briggs Institute has several critical appraisal tools according to the study design.
https://jbi.global/critical-appraisal-tools
I believe it is fine to modify an existing risk of bias tool. One can make their own, but you may be duplicating work, when you can use a pre-made one.
Different fields and sub-fields, have different types of studies and issues, so no one tool can work for all fields.
Self-made and self-tailored risk of bias tool are common to be used, especially for studies that might don't have any suitable risk of bias, such as in-vitro studies. However, it might be better to properly look for any available RoB tool or most closely related