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This shows a peafowl, but 3rd and 4th pictures show what you're looking for in a chicken's mouth. https://unitedpeafowlassociation.org/articles/oral-medication-dosing-of-peafowl/#:~:text=Open%20the%20mouth%20wide%20and,you%20or%20down%20the%20trachea More info...

Before you do this, search for "tube feeding." You will need some tubing and a syringe. I'll try to find my info, but in case I don't, you can look through information here on BYC.