Python flask how can i insert a variable in LIKE sql

Im struggeling on this problem with excuting sql in my flask python app.

Im trying to excecute a like function with a variable that im recieving from my get reqs.

for example i’ve tried this yet :

rows = cursor.execute(f"SELECT * FROM vragen WHERE vraag LIKE ':text'",
                      {"text": '%' + query + '%'}).fetchall()

but this gives me an empty array unfortunately.

This gives me data but then im not using a variable which i need in this case.

rows = cursor.execute(f"SELECT * FROM vragen WHERE vraag LIKE '%which%'").fetchall()

Does anyone know an easy to way to solve this?

Thanks for advance