I am not an iPhone person, but I am pretty sure there must be lots of apps, even free ones, that would let you do what you want.
This is what Perplexity.ai had to say about this:
"Which free iPhone app offers the best interactive hue adjustment?
Based on the search results and considering the current date of March 23, 2025, the best free iPhone app for interactive hue adjustment is Snapseed.
Snapseed is a powerful and versatile photo editing app that offers a range of features, including precise color adjustment tools. It allows you to:
Open and modify both RAW and JPG files
Adjust exposure and tune images with disoriented colors
Make automated or manual color adjustments
What sets Snapseed apart for hue adjustment is its intuitive interface and professional-grade tools, which are particularly useful for fine-tuning colors in your photos. The app provides non-destructive editing, meaning you can always revert changes or adjust them later without losing quality.
While there are other apps mentioned in the search results, such as Adobe Photoshop Express and VSCO, Snapseed is consistently recommended as one of the best free options for powerful photo editing on iPhone, including color grading and hue adjustment."
Also, if you are using the LP filter, that's mostly hydrogen alpha, so the image is supposed to be red.
