If colours are accessible, will a gradient between those colours be accessible?

I work on websites where accessibility is an absolute must have, we aim for at least AA standard. Typically we use resources such as https://contrast-ratio.com and https://contrastchecker.com to test a background colour against black or white text.

In this instance let's take white (#fff) text at a size of 18px. Colour one: #546FAF has a ratio of 4.92 Colour two: #B349B1 has a ratio of 4.66

If I made a linear gradient between those two colours as a background, would #fff text at 18px be safe accessibility wise? I've tried colour picking colours near the text that look close, but hoping it's a simple answer of during that gradient it would never go below the 4.5 ratio.

Thanks!