How to automate referall submission on website with no api or bulk uploading functionality?

I’m needing to upload leads automatically to a referral system that currently doesn’t allow bulk uploading of any kind, has no API. You have to navigate to login page, login, then click a button and then populate a form manually to submit a referral. Does anyone have recommendations for a tool that could possibly automate this for every new lead that comes in? Something like Zapier trigger (Google sheets new row) -> web browsing automation -> submits new lead information as a referral.
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