how to sending a parameter like inject form username and password

in python we have selenium and if i want inject form i just need add like below code
# opening the website in chrome.
driver.get(url)

# find the id or name or class of
# username by inspecting on username input
driver.find_element_by_name(
    "id/class/name of username").send_keys(username)
 
# find the password by inspecting on password input
driver.find_element_by_name(
    "id/class/name of password").send_keys(password)
 
# click on submit
driver.find_element_by_css_selector(
    "id/class/name/css selector of login button").click()

but is posible in flutter?

No files, tests, or plugin entry points are identified. First determine which Flutter plugin and form or web-view context this question concerns, then clarify the expected username, password, and submission behavior before defining a documentation change and its completion criteria.