Hello!
1. To begin with, we create an additional process field with the string type.
2. Then we go to the status settings on which we will change the date.
3. Set the action "Stop performing the following actions when conditions are met"
In it, we specify the Additional process field that was created in step 1 with the following settings
https://prnt.sc/10hc6nq4. Behind it we put the action "Set the date of execution (completion) of the process" and indicate the desired date
5. The last step is to set "Fill in the process or contact field" with the following settings
https://prnt.sc/10hc7kfAs a result, we get the following order
https://prnt.sc/10hc87xOn the first transition, the date will change, on subsequent transitions it will not.