Convert tags to custom text field w smart rule

Thank you!

I did have a number field. When trying around w a smart rule I could’t not assign “Insert Placeholder” to the number field. After changing it to text field “Insert Placeholder” was available. Anyway, I couldn’t extract a string from the tag to insert to the custom field.

I’m not good w scripts, so I was hoping for a smart rule solution.

But thank you for your advice!